every so often we experience some chemical reactions inside of us that make us wish for contact with other beings of our same nature to get in the same act that serves as a way to preserve our species, and our personalities suffer subtle changes that favour that to happen
after that we return to our usual (and sometimes shyer) self until time pases and the cycle repeats
There is almost always a rutting season and it can get very intense. With humans hornyness is all the time and more controlled.
I hate to think that this is controlled horniness, what we experience