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Sexual Conflict After Conception S Sexual Conflict After pressure would also lead to men and women fac- Conception ing different adaptive problems during a marriage. A major sex-specific conflict that can arise centers T. Joel Wade, Kelsey Salerno and James Moran around the issue of paternity certainty. Evolution- Department of Psychology ary psychologists point out that worldwide cuck- Bucknell University, Lewisburg, PA, USA oldry rates range from 1.7% to 29.8% (Anderson 2006; Shackelford and Goetz 2007). Additional related conflicts such as violence, decrease in The Adaptive Function of Marital intercourse frequency, kin resemblance, the Dissatisfaction During Child–Rearing 4-year itch, and infidelity may also arise after conception. It can be argued that the dissatisfaction that occurs Research by Lucas et al. (2008) suggests some in a marriage serves an adaptive function cultural and evolutionary components to marital (Shackelford and Buss 1997). Pair-bonding satisfaction in general. This research reveals that among humans, in particular a union of marriage, there may be some universal component to effec- likely evolved to increase the reproductive bene- tive communication skills when it comes to rais- fits for both sexes (Betzig 1989; Buss and Schmitt ing an offspring, which would have been adaptive 1993). If a marriage is not maximizing the poten- in order to successfully raise a child. This theory is tial benefits and the costs that incur from the further extended by Cox et al. (1999), who found relationship outweigh the benefits, then the dissat- that those couples who had at least one partner isfaction that arises would serve to bring aware- with positive problem-solving skills prenatally ness of the issues that occur in the marriage. If a had higher marital satisfaction than those couples couple decides that a relationship is no longer in which neither partner showed this set of skills. beneficial, then the negative emotions associated Those couples with better problem-solving skills with this dissatisfaction would cause one or both also reported less of a drop in how satisfied they of the individuals involved to either address the were after the child was born. problems or to end the current relationship to find a more beneficial partnership. The adaptive challenges for both sexes during Violence During Pregnancy a union following conception would have been mate retention and the care of offspring. Since Violence during pregnancy has been seen men and women have different reproductive strat- throughout history, often being viewed as a egies (Buss 1989a), those differences in selective product of a patriarchal society. However, # Springer International Publishing AG, part of Springer Nature 2018 T. K. Shackelford, V. A. Weekes-Shackelford (eds.), Encyclopedia of Evolutionary Psychological Science, https://doi.org/10.1007/978-3-319-16999-6_2014-1 2 Sexual Conflict After Conception evolutionary psychologists view violence during attempt to kill the offspring, thus terminating the pregnancy as a product of male sexual jealousy pregnancy. stemming from anxiety that the child their partner Prior research indicates that when a man has is carrying is not theirs (Deacy and McHardy sex with a spouse, he establishes sexual prece- 2013). Since men do not have paternity certainty, dence over her giving him access to her future they may resort to violence against their partner. sexuality (Shotland and Goodstein 1992). This For women, there is certainty of paternity because also happens when a man impregnates a spouse fertilization is internal, and women carry the child. (Sales and Murphy 2000). This sexual precedence Men, however, can be cuckolded and wind up can be interpreted from an evolutionary perspec- contributing resources to a child who is his genetic tive where it occurs to try to ensure paternity offspring. certainty and monopolize a spouse’s reproductive Cuckoldry ultimately decreases a man’s fitness potential. and increases another man’s fitness. This potential Male feelings of sexual precedence can also of being cuckolded is why men are often more lead to abuse in the form of threats (McFarlane upset if their partner commits sexual infidelity et al. 2002). Communicating threats to a pregnant rather than emotional infidelity (Kuhle 2011). spouse may serve as a method of mate retention Upon discovering that a man’s partner has become designed to lower her mate value in her eyes pregnant by someone else, the said man may which makes it harder for her to feel she can direct violence against his partner to kill the devel- attract another quality mate, keeping her with the oping offspring (Friedman and Shackelford 1999 father of her offspring. McKibbin et al. (2007) as cited in Buss and Duntley 2011). indicate that men can insult their intimate partners Given this risk intimate partner violence is as a form of mate retention. But, this has not been twice as likely in response (Burch and Gallup tested with men and their pregnant spouses/ 2004), and the prevalence of intimate partner vio- partners. lence during pregnancy ranges from 1% to 20% (Gazmararian et al. 1996). Cross-culturally, this statistics holds true also. A South African study After Delivery: Resemblance to Kin as a indicates that at least 20% of women experience at Decision–Maker to Investment least one act of physical violence during their pregnancy (Groves et al. 2015). Additionally, Due to paternity uncertainty, men may never women who are abused are more likely to be know if the child they are providing resources pregnant with another man’s child (Martin et al. for is his genetically related offspring. But, one 2004). Similarly, longitudinal research indicates way a man may seek to resolve this issue is via that partner jealousy and partner suspicion of infi- facial resemblance between him and his offspring. delity are strongly correlated with intimate partner Research indicates that when families observe violence (IPV) (Hellmuth et al. 2013). These find- newborn babies, both the mother and her family ings clearly show that abuse during pregnancy can claim the newborn looks like the father (Daly and be attributed in part to a man’s suspicion of infi- Wilson 1982). This represents an underlying delity on the part of his partner. mechanism attuned to familial resemblance of From this previous research, one may reason the father in order to facilitate parental investment that IPV could be seen as a form of infanticide by the father. Research supports this. Burch and also. While abuse may seem to be directed toward Gallup (2000) report that violence directed to the the woman herself, a Nicaraguan study indicates child and the mother is negatively correlated with half of the women who were pregnant and sub- a greater sense of paternal resemblance. Also, men jected to violence were injured from attacks react in a more positive manner and invest more, directed to their abdomen (Valladares et al. hypothetically, when an offspring resembles them 2005). The abdomen may be targeted in an (Platek et al. 2002, 2003). As paternal resem- blance and mate fidelity increase, so does the Sexual Conflict After Conception 3 increase in investment to the offspring (Apicella reports of above average marital satisfaction. and Marlowe 2004). Furthermore, the area of Research shows that married couples experience men’s brains that play a role in decision-making a decrease in satisfaction and confidence in their respond differently to resemblance, compared to relationship and an increase in negative commu- women’s brains (Platek et al. 2004). These find- nication and poor conflict management (Doss ings suggest that facial resemblance is an impor- et al. 2009). tant factor for paternal investment in offspring and From an evolutionary perspective, the decline as such suggest that kin resemblance may play a in satisfaction due to conflict can be accounted for role in conflict after conception occurs. by selective pressures. For example, men take the role of fatherhood more negatively than women (Gray and Crittenden 2014), since men typically Problems After the First Child are more interested in short-term mating (Buss and Schmitt 1993), consistent with parental Four-Year Itch investment theory. A woman may not be as Couples often have a decline in marital happiness stressed with the arrival of a child because she is after approximately 4 years (Fisher 1989; Kurdek more interested in long-term mating (Buss and 1999), and researchers have speculated that it Schmitt 1993) and because she is certain that the could be the outcome of boredom in a marriage offspring is hers, whereas men may not have (Kurdek 1999). From an evolutionary perspec- paternity certainty (Trivers 1972). tive, there may be a biological drive for a new In our current world, children are also weaned partner after 4 years because 4 years are the typ- earlier than they were in ancestral societies which ical amount of time needed to ensure the survival lead to more involvement in child-rearing from of the hominid infant through weaning (Fisher the father. This adds an additional stressor of an 1989). Infants are altricial when they are born increased need for cooperation between parents to and require an extensive amount of care. There- raise their young. This stressor likely contributes fore, infants are mother nurses, and nursing stim- to fathers experiencing less marital satisfaction ulates a release of oxytocin which facilitates (Doss and Rhoades 2017). attachment between mother and infant (Feldman Other moderating factors that may also con- et al. 2007; Galbally et al. 2011). tribute to increased conflict and decreased marital satisfaction are the gender of the parent, the age of Transition to Parenthood (TTP) offspring, and the number of offspring (Twenge Prior to having their first child, the couple begins et al. 2003). Correlational data indicate that to make plans and anticipate the future with one women typically have less marital satisfaction another, and after the birth of the first child, they than men.
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