Speaking as a victim or sexual assault, it is a disgusting and horrific thing for someone to go through. Its degrading and painful and its not something you ever get over completely.

That being said, I used to and occasionally still have fantasies about it. Its about the complete lack of control for me. That and its kind of like therapy for me too. If I put myself into a controllable situation where I am basically replaying events but I can make them stop... it helps me. Not sure about how it works for people who havent been assaulted before...