To make this ok for whatever reason is not ok in my books, I don't care about her being an older woman and all that garbage. Ok so if he does have this illness, how do you explain his wanting his gf to witness the act? It all points to one thing, he gets off on things that are wrong. I find it disturbing someone is trying to make obvious sickness ok because there is a name for it, history of it and some kind of therapeutic approach to deal with it...so what? IT IS STILL WRONG and the OP is going to get hurt somewhere down the line. I may not have sophisticated knowledge of the illness or its history etc but I do know right from wrong..and what he is doing and trying to involve the op in is wrong on so many levels.