I think it is a reality for many, many people. and the appeal (to me) is to experience the essence of animalistic behavior. sure, to a male dog it is sheer instinct. and there is some question as to whether approaching a female dog constitutes rape. but from the male-dog-to-female-human perspective... that utter abandon and base "get it done now" drive that animals have is intoxicating. that, and the idea of experiencing the knot and a long tie... yeah... it's a fantasy, but one I wouldn't mind working on bringing to the real world!!