I refer to sex as 'mating'
I started referring to sex as mating just as a joke, but now I'm serious when I say it. I also say things like "I'm going out tonight to find a female to mate with". I'm also going to call my next girlfriend my mate. If the term is good enough for the animals then it's good enough for us. I don't see why we should have separate sex terms for animals and humans anyway, we're animals too. It's just a way to boost our own self-importance. There's really no difference between animals engaging in mating rituals and humans going to nightclubs.