It's the biological imperative of all life- to pass on their genes, make sure the species stays alive, with a bit of themselves thrown into the mix of the ol' gene pool. There's all sorts of rewards, physical and mental, that our body create when engaged in the act, and afterwards. Something to do with bonding and making sure the offspring is looked after, so the species marches on. We've just added all sorts of weird touches to the whole mating rituals and whatnot, being a bunch of mad monkeys we are.
I don't know from personal experience, really. All I got is a textbook answer, with a touch of little ol' cynical me.
I don't know from personal experience, really. All I got is a textbook answer, with a touch of little ol' cynical me.