yes but it's not going against our genes because our genes express themselves vis a vis biology and the big brain is just as much part of that biology, and hence the pleasure we get from our higher brain is as much real and in line with our genes as the pleasure we get from our other organs eg penis, vagina etc.
My point is that our big brain (which is, of course, a product of our genes) allows us to learn stuff, and that the content of what our brain learns has little or nothing to do with our genes, and everything to do with culture and environment - it is only the ability to learn which is genetic.
So our big brain (caused by genes) allows us to learn things (nothing to do with genes) which may cause us to behave in ways which go against instinctual urges such as sex drive, hunger etc. (caused by genes).
So our big brain, whilst a product of evolution, allows us to learn things which allow us to behave in ways contrary to our more basic behavioural instincts ie to 'go against our genes'. Animals rarely if ever display this ability.
) and it's not hard to see how other animals could easily out-compete humans. If anything, the question ought to be "how on earth did these freaks manage to survive, with all that's stacked against them?" Hence my "just-so" story as Crhis puts it - in this situation you either have social solidarity or you don't have big brains.





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but sexual desire involves so many aspects that are massively superflous (and infact can in many ways be a hinderance on) to the act of reproduction. Infact just as our big brains might have evolved because of success in hunting and yet allowed the creation of music, so the orgasm evolved because of it's sucess in reproduction, it also creates a surplus, that surplus is our "sexuality". Therefore our sexual desire is as much a side effect as music.