We don’t know for sure the reasons why human females developed concealed ovulation through the evolutionary process, but the general belief is that it helped to ensure that males stayed with their mates and assisted with the child-rearing process.(The theory is that a male would be more likely to stay with one female if she were receptive to sex all the time and not just when she was fertile; that a male could not be certain whether he had successfully impregnated a female who engaged in sex even when she was not ovulating and therefore had to stick around to make sure he completed the task; that a male was less likely to go off in search of other mates when he had no way of knowing when they were fertile either; and that since a male did not know when his mate was ovulating and subject to being impregnated by other males, he had to stay around to defend against the intrusion of rivals.) Therefore, we say that we humans engage in “sex for pleasure” not just because sex is something we consider to “feel good,” but because it meets the criterion specified above: both men and women willingly engage in sex even though neither one of them may know for certain that the woman is fertile, and even at times when fertilization is impossible (such as when the woman is already pregnant or is post-menopausal).The above claim revolves around a very specific definition of “sex for pleasure,” which in this case is copulation between the male and female of a species where such activity is completely separated from the purpose of fertilization.That is, in only a couple of animal species other than humans will males and females willingly (and regularly) engage in sex with each other even when there is no possibility that offspring will be produced as a result.
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