Old Freud was four times right when he believed that sexuality controls everything in the body. Even take this pretty redhead - while she is waiting for a friend for hot sex, she imagines all sorts of phallic objects, and when a friend comes to visit, she fucks the sweetheart hard in an ace, although she dreamed of petting with elements of licking a manda. So in nature we want one thing, but we get to a completely different place.
