I knew that. Someone I know did a fic a while back in which a gay guy was raped by a girl. I wasn't fully clear on the details, but I knew it was possible. I just didn't know that friction is enough to make it do that, and even if I did I thought the fear would cancel it out. I was having visions of ... okay, you know how when you tie a cord around your finger really tight it traps the blood and your finger goes purple? And he was already tied up so ... I'm just gonna stop right there.