That is such a shortsighted evolutionary view of sex for many reasons but two immediately come to mind: 1. Sex in humans clearly has a social role between the

That is such a shortsighted evolutionary view of sex for many reasons but two immediately come to mind: 1. Sex in humans clearly has a social role between the mating. Because they raise the child together for the first few years of the child's life, having a positive, loving relationship with each other is important. It is part of the reason that oxytocin is released during sex -- to facilitate social bonding. 2. There is emerging evidence that there is an increased chance of impregnation if the woman has an orgasm. Thus, having the guy last long enough to get her there actually increases the chance of offspring and thus survival of your genome. My broader point (and frustration with your point) is people way too often reduce evolutionary advantage to a hyper-simplistic single dimensional thing. While, yes, it all comes down to propagating your genome, when you add in social creatures living in groups, the incentives / game theory becomes so much more complicated.