I still want to stress that there are non exploitive outlets such as erotica. In fact, some of the best erotica out there is written by women. This allows people to explore the fantasies they need to entertain while not hurting anyone. It would also enable him to do this without betraying your trust.

Men and women are different and we relate to sex differently. I'm a little worried that completely stifling his urges will suffocate him on some level and after a long enough period that could lead to resentment or acting out.

Cyran0