Human beings are a strange animal. While their need for sex can be less all-consuming than certain other species, they have it a lot more often and in a lot more creative ways. Still, they're not animalistic, you know. They have morals and modesty and humility. That's why they don't run around rutting like wild beasts.
At least, that is, when they have something separating them and the rest of the animal kingdom.
( MORE BEHIND THE CUT [TRIGGER WARNING: Mentions of non-con, dom/sub, and other things that go with the mating theme. Also, heavy kink.] )