The last time you had sex, there was arguably not a thought in your head. O.K., if it was very familiar sex with a very familiar partner, the kind that--truth be told--you probably have most of the time, your mind may have wandered off to such decidedly nonerotic matters as balancing your checkbook or planning your week. If it was the kind of sex you shouldn't have been having in the first place--the kind you were regretting even as it was taking place--you might have already been flashing ahead to the likely consequences. But if it was that kind of sex that's the whole reason you took up having sex in the first place--the out-of-breath, out-of-body, can-you-believe-this-is-actually-happening kind of sex--the rational you had probably taken a powder.
Losing our faculties over a matter like sex ought not to make much sense for a species like ours that relies on its wits. A savanna full of predators, after all, was not a place to get distracted. But the lure of losing our faculties is one of the things that makes sex thrilling--and one of the very things that keeps the species going. As far as your genes are concerned, your principal job while you're alive is to conceive offspring, bring them to adulthood and then obligingly die so you don't consume resources better spent on the young. Anything that encourages you to breed now and breed plenty gets that job done.
But mating and the rituals surrounding it make us come unhinged in other ways too, ones that are harder to explain by the mere babymaking imperative. There's the transcendent sense of tenderness you feel toward a person who sparks your interest. There's the sublime feeling of relief and reward when that interest is returned. There are the flowers you buy and the poetry you write and the impulsive trip you make to the other side of the world just so you can spend 48 hours in the presence of a lover who's far away. That's an awful lot of busywork just to get a sperm to meet an egg--if merely getting a sperm to meet an egg is really all that it's about.
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