@mujus: you said 'You have a very odd notion of "human function."'
Humans eat, fuck and fight. Mediated by culture.
These are social level functions above the mechanics of digestion, breathing, and muscle use.
It is not hard to avoid fghting (for most adults, though some kids struggle) society mediates that behaviour.
Sex is held up as this amazing thing which you can't have, used to sell products and banned in public places... Somehow everywhere and nowhere. Teens go through rebellious phases regardless (something to do with leaving the nest, they have become physically capable of surviving on their own; out society is more comppex emotionally and economically, which leads to trouble) but they still compete with each other for status, and sex is a great option for them.
Religion tries to mediate this. While when it comes to violence their peers are mediating the behaviour. It is undesirable to all. (when it comes to food we eat without much thought, by and large, to any consequences beyond our own health, convienance and pleasure/flavour enjoyment - that is beyond our egos)
Society mediates human behaviour, always has, whether it was parents showing offspring what food to eat, or how to fish (the best source of hunted protien for 'hunter gatherers' was fish)
Society mediates when it is ok to be violent, and how - American football, boxing, fencing... there are many acceptable forms of violent sports in our society. And different subcltures have different standards - prisons tend toward violent competition, poor urban neighbourhoods where teens can't compete for jobs, income, political status or academic achievement tend to end up more violent (this acts as a survival trait, scaring off potential threats by being threatening, at least for male teens, femape teens tend to see a spike in their pregnancy rates rather than violence rates, again survival is being guarenteed by reproducing)
So yes, all normal things, all mediated by culture. But this is a question of public p