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THE PHYSIOLOGY and ECOPHYSIOLOGY of EJACULATION Tropical and Subtropical Agroecosystems, Vol
Tropical and Subtropical Agroecosystems E-ISSN: 1870-0462 [email protected] Universidad Autónoma de Yucatán México Lucio, R. A.; Cruz, Y.; Pichardo, A. I.; Fuentes-Morales, M. R.; Fuentes-Farias, A.L.; Molina-Cerón, M. L.; Gutiérrez-Ospina, G. THE PHYSIOLOGY AND ECOPHYSIOLOGY OF EJACULATION Tropical and Subtropical Agroecosystems, vol. 15, núm. 1, 2012, pp. S113-S127 Universidad Autónoma de Yucatán Mérida, Yucatán, México Available in: http://www.redalyc.org/articulo.oa?id=93924484010 How to cite Complete issue Scientific Information System More information about this article Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Journal's homepage in redalyc.org Non-profit academic project, developed under the open access initiative Tropical and Subtropical Agroecosystems, 15 (2012) SUP 1: S113 – S127 REVIEW [REVISIÓN] THE PHYSIOLOGY AND ECOPHYSIOLOGY OF EJACULATION [FISIOLOGÍA Y ECOFISIOLOGÍA DE LA EYACULACIÓN] R. A. Lucio1*, Y. Cruz1, A. I. Pichardo2, M. R. Fuentes-Morales1, A.L. Fuentes-Farias3, M. L. Molina-Cerón2 and G. Gutiérrez-Ospina2 1Centro Tlaxcala de Biología de la Conducta, Universidad Autónoma de Tlaxcala, Tlaxcala-Puebla km 1.5 s/n, Loma Xicotencatl, 90062, Tlaxcala, Tlax., México. 2Depto. Biología Celular y Fisiología, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510, México, D.F., México. 3Laboratorio de Ecofisiologia Animal, Departamento de Fisiologia, Instituto de Investigaciones sobre los Recursos Naturales, Universidad Michoacana de San Nicolás de Hidalgo, Av. San Juanito Itzicuaro s/n, Colonia Nueva Esperanza 58337, Morelia, Mich., México * Corresponding author ABSTRACT RESUMEN Different studies dealing with ejaculation view this Diferentes estudios enfocados en la eyaculación, process as a part of the male copulatory behavior. -
UNJ February 03
Man’s Search for Ultimate Sex: Viagra® Abuse Jeffrey A. Albaugh Susan Kellogg-Spadt n an age when men aspire for “extreme” perfor- mance in all aspects of their lives, sexual per- safe, but encouraged the young man to seek medical formance is no exception. As a result, the drug advice prior to further use. Curiosity about Viagra sildenafil citrate (Viagra®) is being routinely abounds with men wondering about its ability to Iused and abused by men of all ages (who have not improve the quality and rigidity of erections, been diagnosed with erectile dysfunction) to facili- decrease the refractory period after ejaculation, and tate the ultimate sexual experience. Men might use increase libido. Danner (2001) reports that Viagra is this drug to counteract or coincide with other recre- one of the “party drugs” of our times and there are ational drugs, to improve the quality and longevity reports that it is prevalent in British nightclubs and of an already adequate erection, or to shorten the restaurants under the name “poke” (Canadian normal physiologic refractory period between erec- Medical Association, 1998). Widespread Viagra use tions. Although there is no indication or document- is also reported as a trend among gay men in the ed evidence for improved erectile function in party scene (Contemporary Sexuality, 2001; Men’s healthy young men, the use of sildenafil citrate Fitness, 2002). among this population is thought to improve erec- tile longevity and rigidity by these men. Mixing Drugs Man’s search for improved sexual function In recreational use, Viagra is being mixed with would be better served by his learning about the other street drugs such as ecstasy (methylene- arousal response cycle and the type and amount of dioxymethamphetamine), uppers (amphetamines), loveplay that might lead his partner to the greatest crystal methadone, and poppers (amyl nitrate) into level of satisfaction. -
Critical Androgen-Sensitive Periods of Rat Penis and Clitoris Development Michelle Welsh,* David J
international journal of andrology ISSN 0105-6263 ORIGINAL ARTICLE Critical androgen-sensitive periods of rat penis and clitoris development Michelle Welsh,* David J. MacLeod,* Marion Walker, Lee B. Smith and Richard M. Sharpe MRC Human Reproductive Sciences Unit, Centre for Reproductive Biology, The Queen’s Medical Research Institute, Edinburgh, UK Summary Keywords: Androgen control of penis development/growth is unclear. In rats, androgen androgens, clitoris, flutamide, hypospadias, action in a foetal ‘masculinisation programming window’ (MPW; e15.5–e18.5)’ masculinisation programming window, predetermines penile length and hypospadias occurrence. This has implications micropenis, penis length for humans (e.g. micropenis). Our studies aimed to establish in rats when andro- gen action/administration affects development/growth of the penis and if deficits Correspondence: Richard M. Sharpe, MRC Human Reproductive in MPW androgen action were rescuable postnatally. Thus, pregnant rats were Sciences Unit, Centre for Reproductive treated with flutamide during the MPW ± postnatal testosterone propionate Biology, The Queen’s Medical Research (TP) treatment. To assess penile growth responsiveness, rats were treated with Institute, 47 Little France Crescent, Edinburgh, TP in various time windows (late foetal, neonatal through early puberty, puberty EH16 4TJ, UK. E-mail: [email protected] onset, or combinations thereof). Phallus length, weight, and morphology, hypo- *Contributed equally to the manuscript. spadias and anogenital distance (AGD) were measured in mid-puberty (d25) or Re-use of this article is permitted in adulthood (d90) in males and females, plus serum testosterone in adult males. accordance with the Terms and Conditions MPW flutamide exposure reduced adult penile length and induced hypospadias set out at http://www3.interscience.wiley. -
11 A. Excitement. for Men, This Involves Erection of the Penis
A. Excitement. For men, this involves erection of the penis, which usually occurs within a few seconds after sexual stimulation begins. In addition, skin ridges of the scrotum smooth out and the testes are drawn towards the body. B. Plateau. In men, the diameter of the head of the penis increases slightly and deepens in color because of increased blood flow. Vasocongestion also causes the testes to swell, becoming 50 to 100 percent larger than in the unstimulated state. In addition, small amounts of clear fluid may sometimes be secreted from the Cowper’s gland and appear from the male urethra. C. Orgasm. Men ejaculate semen during this stage, which actually has two parts: First, men experience a sensation of ejaculatory inevitability, which occurs just before ejaculation begins. Second, contractions of the urethra, penis and prostate glad serve to expel semen from the head of the penis. D. Resolution. Immediately after ejaculation, men enter a refractory period, during which further orgasm or ejaculation is not possible. This time varies greatly between men and increases with age. A partial loss of erection occurs during the refractory period. Eventually, blood flow to the genitals returns to pre-excitement levels. (Masters and Johnson, 1966). For thirty years this model has served as the foundation for the study of human sexual response and sexual dysfunction. In the 1970s, Kaplan (1974) and later Lief (1977) identified a subset of individuals whose sexual dysfunction did not lie within the four stages described by Masters and Johnson (1966). Instead, these people experienced little interest in sexual activity. -
Male Anorgasmia: from “No” to “Go!”
Male Anorgasmia: From “No” to “Go!” Alexander W. Pastuszak, MD, PhD Assistant Professor Center for Reproductive Medicine Division of Male Reproductive Medicine and Surgery Scott Department of Urology Baylor College of Medicine Disclosures • Endo – speaker, consultant, advisor • Boston Scientific / AMS – consultant • Woven Health – founder, CMO Objectives • Understand what delayed ejaculation (DE) and anorgasmia are • Review the anatomy and physiology relevant to these conditions • Review what is known about the causes of DE and anorgasmia • Discuss management of DE and anorgasmia Definitions Delayed Ejaculation (DE) / Anorgasmia • The persistent or recurrent delay, difficulty, or absence of orgasm after sufficient sexual stimulation that causes personal distress Intravaginal Ejaculatory Latency Time (IELT) • Normal (median) à 5.4 minutes (0.55-44.1 minutes) • DE à mean IELT + 2 SD = 25 minutes • Incidence à 2-11% • Depends in part on definition used J Sex Med. 2005; 2: 492. Int J Impot Res. 2012; 24: 131. Ejaculation • Separate event from erection! • Thus, can occur in the ABSENCE of erection! Periurethral muscle Sensory input - glans (S2-4) contraction Emission Vas deferens contraction Sympathetic input (T12-L1) SV, prostate contraction Bladder neck contraction Expulsion Bulbocavernosus / Somatic input (S1-3) spongiosus contraction Projectile ejaculation J Sex Med. 2011; 8 (Suppl 4): 310. Neurochemistry Sexual Response Areas of the Brain • Pons • Nucleus paragigantocellularis Neurochemicals • Norepinephrine, serotonin: • Inhibit libido, -
Medical Term for Erection
Medical Term For Erection Chase remains half-baked: she reprices her symphonists inhibit too anagogically? Immunologically spooky, quick-fireRonald cesses and black-a-vised. epigraph and dent Lachlan. Tineid Tuckie face-harden very sevenfold while Muffin remains Ici in the partial thrombosis of medical term offensive by increasing age appears to, the penis is impaired in penile curvature in the cremaster muscle relaxation in Advise immediate medical attention attention this give of erection has lasted for succession to. Erection Definition of Erection by Merriam-Webster. The medications for medically proved. Using the term erectile dysfunction makes it clear that exchange other problems are not. Yes Blue Balls Is a casual Thing worth It's read Easy sweet Treat. Erectile Dysfunction Top 10 Causes GoodRx. In cabbage body meaning they are working out increase blood flow within your penis and. Normally for erection problems diagnosed and erect human services, mental disorders affect erectile function and priapism is an implant. Priapism An Erection that Lasts Too Long Memorial Sloan. Blood clots cause 4-hour erection in luggage with coronavirus. An erection is a physiological phenomenon in danger the penis becomes firm engorged and. Depressed teenage boy sitting alone with secure cloud describing. Placing a modern management. Affirm was created and erect gets their sleep. This is over the less risk factor in aj, all boys do not treated for ed but less invasive ed a permanent? From a medical standpoint failure to absorb an erection 20 of end time is typically not cause community concern trust it occurs more than 50 percent of summon time act is. -
Erection Disorders
CHAPTER 11 ERECTION DISORDERS Despite the current rhetoric. about sex and intimacy’s involving more than penile-vaginal inter- course, the quest for a rigid erection appears to dominate both popular and professional interest. More- over, it seems likely that our diligence in finding new ways for overcoming erectile difficulties serves unwittingly to reinforce the male myth that rock-hard, ever-available phalluses are a necessary compo- nent of male identity. This is indeed a dilemma. 1 ROSEN AND LEIB L UM , 1992 GENE R A L CONSIDE R ATIONS The Problem A 49-year-old widower described erection difficulties for the past year. His 25-year marriage was loving and harmonious throughout but sexual activity stopped after his wife was diagnosed with ovarian cancer six years before her death. Their sexual relationship during the period of her illness had been meager as a result of her lack of sexual desire. Although he missed her greatly, he felt lonely since her death three years before and, somewhat reluctantly at first, began dating other women. A resumption of sexual activity soon resulted but much to his chagrin he found that in contrast to when he would awaken in the morning or masturbate, his erections with women partners were much less firm. He felt considerable tension, particu- larly because some months before, he had developed a strong attachment to one woman in particular and was fearful that the relationship would soon end because of his sexual troubles. As he discussed his grief over the loss of his wife and talked about his guilt over his intimacy with another woman, his erectile problems began to diminish. -
Case Report Absence of Orgasm-Induced Prolactin Secretion in a Healthy Multi-Orgasmic Male Subject
International Journal of Impotence Research (2002) 14, 133–135 ß 2002 Nature Publishing Group All rights reserved 0955-9930/02 $25.00 www.nature.com/ijir Case Report Absence of orgasm-induced prolactin secretion in a healthy multi-orgasmic male subject P Haake1, MS Exton1*, J Haverkamp1, M Kra¨mer1, N Leygraf2, U Hartmann3, M Schedlowski1 and THC Krueger1 1Department of Medical Psychology, University Clinic of Essen, Essen, Germany; 2Department of Forensic Psychiatry, University Clinic of Essen, Essen, Germany; and 3Department of Clinical Psychiatry, Hannover Medical School, Hannover, Germany In several studies we have recently demonstrated that orgasm induces prolactin secretion in healthy males and females. This suggests that prolactin may form a feedback regulator of the refractory period following orgasm. To examine this position we investigated the prolactin response of a healthy multi-orgasmic male subject. Blood was drawn continuously during masturbation-induced orgasm. The prolactin response of the case-subject was compared with that of nine healthy adult men with a normal refractory period. The case-subject showed no prolactin response to three orgasms. Data from this multi-orgasmic subject support the hypothesized role of plasma prolactin in contributing to sexual-satiation mechanisms. International Journal of Impotence Research (2002) 14, 133–135. DOI: 10.1038=sj=ijir=3900823 Keywords: sexual arousal; prolactin; multi-orgasmic; model; refractory period; neuroendo- crinology Introduction fulfilling the criteria for multi-orgasmic and multi- ejaculatory males.7 Sexual dysfunction is a commonly reported side effect of psychiatric medication, underscoring the importance of neuroendocrine mechanisms in reg- Methods ulating sexual competence.1,2 Thus, we recently designed a continuous blood sampling technique and sexual arousal paradigm to investigate endo- The case subject (aged 25 y) reported an average crine mechanisms regulating sexual arousal. -
Newsletter - 3
Newsletter - 3 Dr. Hafizur Rahman Female SEXUAL RESPONSE CYCLE Dr. SEEMA SHARMA, MBBS, DGO, MD, FICOG, FRCOG Director- Srishti Fem care Sr. Consultant, Ob/Gyn @ Apollo cradle www.Srishtifemcare.com The Sexual response cycle Refers to a series of emotional and physical changes that occur when a person is sexually aroused and participates in sexually stimulating activities, including intercourse and masturbation. India is the 5th most sexual countries in the world but the sexual education is by far lagging behind and knowledge of Sexual response cycle may help to pin point the exact cause of sexual issues a couple might be facing. Low sexual desire, painful sex and inability to climax are common complaints in our OPD’s. Scientists have proposed many models of human sexual behavior and one of the pioneers have been Masters and Johnson’s model. According to this linear model the sexual response cycle has four phases which progress linearly from one stage to the next. These stages are: Excitement/ desire Plateau Orgasm Resolution Now newer models like the Basson’s circular model have tried to fulfill the lacunas of earlier models and incorporate how an earlier pleasant sexual experience and enhance the quality of present experience and vice versa. Other Models Desire/ Excitement Phase: In this phase women emotionally want to have sex and the desire may start much before a formal physical foreplay. If she feels wanted or gets the right environment as in a romantic dinner, kissing, sexting etc. the desire gets heightened and if she feels rushed into physical sex, it may cause inhibition of desire and rejection of the male partner and subsequent physical act. -
Neuromorphology and Neuropharmacology of the Human Penis: an in VITRO STUDY
Neuromorphology and Neuropharmacology of the Human Penis: AN IN VITRO STUDY George S. Benson, … , Joseph N. Corriere Jr., Joe Wood J Clin Invest. 1980;65(2):506-513. https://doi.org/10.1172/JCI109694. The neuromorphology and neuropharmacology of the human penis are only briefly described in literature. The present study was undertaken to define the adrenergic and cholinergic neuromorphology of the human corpus cavernosum (CC) and corpus spongiosum and to evaluate the in vitro response of the CC to pharmacologic stimulation. Human penile tissue was obtained from six transsexual patients undergoing penectomy. For morphologic study, the tissue was processed for (a) hematoxylin and eosin staining; (b) smooth muscle staining; (c) acetylcholinesterase localization; (d) glyoxylic acid histofluorescence; (e) electron microscopy; and (f) electron microscopy after glutaraldehyde dichromate fixation. In addition, strips of CC were placed in in vitro muscle chambers and tension changes recorded isometrically after stimulation with norepinephrine (NE) and acetylcholine. The CC contains abundant smooth muscle, numerous glyoxylic acidfluorescent (catecholaminergic) fibers and varicosities, and a scant distribution of acetylcholinesterase- positive fibers. Fewer of all these elements were present in the corpus spongiosum. No “polsters” were observed in the CC. Although glutaraldehyde-fixed controls exhibited no typical adrenergic vesicles (small, dense core, measuring 400- 600 Å in diameter), some small, strongly electron-dense vesicles were found in glutaraldehyde dichromate-fixed tissue and were thought to contain NE. A variety of other vesicles were also encountered. The addition of NE to the in vitro muscle chambers caused a dose-related contraction, which was blocked by pretreatment with phentolamine in all […] Find the latest version: https://jci.me/109694/pdf Neuromorphology and Neuropharmacology of the Human Penis AN IN VITRO STUDY GEORGE S. -
Duration of Cunnilingus Predicts Estimated Ejaculate Volume in Humans: a Content Analysis of Pornography
Evolutionary Psychological Science (2016) 2:220–227 DOI 10.1007/s40806-016-0057-5 RESEARCH ARTICLE Duration of Cunnilingus Predicts Estimated Ejaculate Volume in Humans: a Content Analysis of Pornography Michael N. Pham1 & Austin John Jeffery1 & Yael Sela 1 & Justin T. Lynn2 & Sara Trevino2 & Zachary Willockx1 & Adam Tratner1 & Paul Itchue1 & Todd K. Shackelford1 & Bernhard Fink3 & Melissa M. McDonald1 Published online: 10 May 2016 # Springer International Publishing 2016 Abstract Humans perform copulatory behaviors that do not a relationship between the time spent performing cunnilingus contribute directly to reproduction (e.g., cunnilingus, and ejaculate quality. prolonged copulation). We conducted a content analysis of pornography to investigate whether such behaviors might Keywords Cunnilingus . Prolonged copulation . Content contribute indirectly to reproduction by influencing ejaculate analysis . Pornography . Ejaculate volume volume—an indicator of ejaculate quality. We coded 100 pro- fessional pornography scenes depicting the same male actor copulating with 100 different females, affording control for “Ejaculate quality” is a composite of ejaculate traits (e.g., between-male differences in estimated ejaculate volume. sperm motility, sperm viability, sperm number) that affect fer- Coders visually estimated ejaculate volume and recorded the tilizing ability (Simmons and Fitzpatrick 2012). Ejaculate vol- time the actor spent engaged in cunnilingus, penile-vaginal ume is another trait indicator of quality. For example, non- penetration, -
Penis Size Interacts with Body Shape and Height to Influence Male
Penis size interacts with body shape and height to influence male attractiveness Brian S. Mautza,1,2, Bob B. M. Wongb, Richard A. Petersc, and Michael D. Jennionsa aResearch School of Biology, Australian National University, Canberra, ACT 0200, Australia; bSchool of Biological Sciences, Monash University, Melbourne, VIC 3800, Australia; and cDepartment of Zoology, La Trobe University, Bundoora, VIC 3086, Australia Edited by Wyatt W. Anderson, University of Georgia, Athens, GA, and approved February 28, 2013 (received for review November 6, 2012) Compelling evidence from many animal taxa indicates that male The upright body posture and protruding, nonretractable gen- genitalia are often under postcopulatory sexual selection for char- italia of male humans make the penis particularly conspicuous, acteristics that increase a male’s relative fertilization success. There even when flaccid. This observation has generated suggestions by could, however, also be direct precopulatory female mate choice evolutionary biologists that the comparatively large human penis based on male genital traits. Before clothing, the nonretractable evolved under premating sexual selection (19, 20). Furthermore, human penis would have been conspicuous to potential mates. This novels, magazines, and popular articles often allude to the exis- observation has generated suggestions that human penis size tence of a relationship between penis size and sexual attractive- partly evolved because of female choice. Here we show, based upon ness or masculinity (21, 22). Many cultures have fashion items, female assessment of digitally projected life-size, computer-generated like penis sheaths and codpieces, that draw attention toward male images, that penis size interacts with body shape and height to genitalia (20), highlighting the potential for female choice to determine male sexual attractiveness.