Actually, there's a great deal of evidence for human sexuality being very much tied into our social habits, and our propensity for orgasms has a lot of social utility and feedback loops. That's why it's nice to feel sexy and know it, man or woman. And, if you look at men and women, and how they select a partner and extra-partner (be it cheating or some arrangement), across the timelines of 20-30, 30-40, 40+, the sexual nature of attraction changes profoundly, as do the feedback loops. And we seem to make a big deal out of trying to find a "best of both worlds - competent, sexy, sexily competent, and competently sexy". Our propensity for an orgasm plays implicit roles in our partner selection as well as explicit roles in our ability to sustain medium to long term intimate partners. For most people, if you cut that off at "cumming for babies" well, phew, that's a bit utilitarian, and definitely not sexy. And, like I said, for some reasons obvious and not-so-obvious, we like to feel sexy.

We're not voles and not praying manti, either. Our semen doesn't turn into a cement, and females don't eat the heads of their mates. Our closest cousins, the Bonobo, has more in common with us than most are comfortable with. Look up Bonobos and tell me you don't see "Uncle Bob" somewhere in the photos; and then look for their sexual habits. Not all primates are like this - it's very unique behaviour in the grand scheme of species.

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