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The question of whether non-human animals enjoy it too is a perennial — and scientifically legitimate — question to ask. Harold McFarland Human sexual behavior is complicated by our ability to predict consequences for our actions, and by our evolutionary history of violence which has made a male protector a valuable assistance to a childbearing woman. If a female's interested in a male, she'll put her swollen bottom right up in his face.
That is startlingly inefficient if the purpose of sex were only reproduction, but clearly, there has been an evolutionary advantage to the bonding achieved by sex. That's in part because this macaque behaviour is sometimes accompanied by the type of physiological changes seen in humans, such as increases in heart rate and vaginal spasms. Genetic tests frequently show that some of the offspring raised by a monogamous pair come from the female mating with an extra-pair male partner.
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