I've only had one bad experience. The guy I was with at the time was a virgin until he met me. I mentioned anal and he was all up for it. I told him to go slow and use lube. That didn't happen. He rammed it in like it was my vagina. I cried ran to the bathroom. I lightly bled for a few days. Not fun at all. It wasn't fun for him either because he got a punch to the face.