No.5749
Some people like to insert themselves into the humiliated character who's being fucked by the ugly bastard, maybe because they get off to the thought of doing something so dirty voluntarily or because they have rape fantasies.
In other cases, people like to see a character they like being humiliated, or turning into a dirty slut, because they find the character attractive and would like to fuck it.
Ugly bastard is a really effective way to please both audiences. Some people might even be part of both groups.