For humans and for certain other animals recreational sex can be highly enjoyable. Even procreative sex among primates and some mammals is thought to provide pleasure for the participants. But for many animal species that’s just not the case. And yet, sex doesn’t need to be fun — or even pain-free — to fulfill its biological purpose. As long as fertilization happens, nature considers the sexual behaviors and appendages in question to be successful, even if the act itself generates physical harm or turns out to be fatal. But these species probably already know that.
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