I'd daresay that the entire collection of birds, bees, fishes and things that creepeth upon the earth enjoy it, not just Humanity as the pic implies. Although, the non-humans mostly (Benobos and Dolphins aside) for genetic motivations... but you can't deny there's SOME pleasure induced in ... even the tiniest brains.
I mean ... c'mon ... sex (even just for procreation) is pretty hard work! There has to be SOME kind of reward other than just leaving your seed behind in some cum-dumpster and disappearing.
It doesn't say only humanity, just that humanity does.