"I'm not prudish but I don't feel my 'camming' with other men or with him would benefit our relationship."
One of the most degrading issues that I faced during my marriage to my ex NPD was that he began demanding that I involve myself in a threesome. He contacted male escort services to inquire about costs, attempted to discuss his male friends as possible partners, and insisted that "all women fantasize about being raped." I never did give in to his demands, thank God. IMO, using one person as a tool (regardless of the reason) for their own sexual gratification has nothing to do with "love," whatsoever. Love doesn't involve fear, degradation, humiliation, shame, or pain (emotional/physical).