Isn't sexual abuse usually about power, not sexual desire? I can understand why the LW raised the "real control" comment and the sister's prior work as a dominatrix, to put the comment in context. I am not convinced that the LW is making the false equivalence Prudie claims, although to be fair, I'm also not convinced that s/he isn't. It would have been nice if the LW had explained why s/he thought that piece of information was relevant.

I agree with the advice, but I also expected Prudie to say that the LW's first responsibility is to his/her son. Although exposing the LW's suspicions might be hurtful to the sister if it is a case of unjustified paranoia, the LW absolutely must uncover the truth of the situation. Equating sex work with molestation is horrific, but, quite frankly, not when compared to child molestation.