For anyone unfamiliar with this type of thing, it's often tagged and/or described on some sites as "Uncommon Stimulation". Horn sex stuff is just kind of a fun kinky thing, I wouldn't think too hard about the logic of it lol
YAAAAAAAAAAAAAAAAAAAAAASSSSSSSSSSSSSSSSSSSSSSSS!!!!! There is going to be sooooooooooo much new fanfiction when this movie comes out. AWWW HELL YEEESSS! I hope it's as good as the former movies. They've had a decade to prepare after all.