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It is often proposed that an inherent “drive to reproduce” explains nonhuman sexual activity, but that is not an alternative here: if animals possess an instinct to reproduce, it needs to function somehow – and pleasure is a fairly basic motivator.
The hypothesis that all sexually reproducing species experience sexual pleasure is, in itself, quite reasonable – as would be the hypothesis that animals find eating pleasurable. Since the word “pleasure” is quite vague, scientists have tended to focus on orgasms.
As with many questions about sex, this exposes some interesting facts about the way we discuss the subject.
On one level, the question of whether humans and nonhumans experience sex in the same way is fairly simply dismissed: how would we know?
It is the result of the pioneering work of Masters and Johnson dating from 1966.