Thats weired, how do people get so FAR out into left field? I just don't know, you can only help your friend by giving a suggestion for herself, it seems like a really demeaning act to participate in, for everyone...but, you know, I'm kind of old fashioned, and I'd be totally mortified to have someone view me that way. It seems like this guy is the type to get people to do more and more outrageous things to turn them on, and too much is never enough. As long as he has willing participants, he's going to keep going and who knows if they're stuff was accessed by OTHERS, has she ever thought that this stuff can be veiwed by other people? Maybe doing a little digging around and research into it can help to give your friend some education into the truth of these things. Offer it, and then let her make up her own mind...be ready to be a shoulder to cry on when she realizes this doesn't make her special, and how easily he will go on to do other things and other women.
Good luck