You must think about it. Our brains are so complex and interesting, if sex wasn't the most pleasurable thing, then we'd be off thinking and expanding our minds and not caring about reproduction. I mean, look at all those scientists that do research alone in a room, for years and years, and they don't get laid.
But, sex is good, sex is fun, so we do it and tend to think about too much as to not expand our brain, i.e. meatheads.
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