Thanks for the responses. I have communicated with him about how his revelation makes me feel. We've talked hours on end about this!
He doesn't understand that I feel uncomfortable with providing him with something that he feels is sinful. In his view, if I don't find it sinful, then I shouldn't have a problem with providing the sex. I just can't make him understand that by continuing to have sex with him would mean that I did not respect his beliefs, and him in general. I mean I wouldn't provide alcohol to an alcoholic, feed pork to a muslim, make a hindu slaughter a cow. lol To me it is a matter of respect for the essense of a person. But perhaps a free love person with a swinger mentality isn't supposed to hold humanity in high regard.
We met on Adult Friend Finders, and I felt we both held healthy views about sexuality. I guess I was wrong. I am thinking that if 40 year old, highly sexual man wants to keep me in an open relationship, and feel guilty about the sex we have, then he isn't appreciating the love and freedom I give him. I do believe that I'll stick to the no sex approach, and offer only my support and friendship. I really feel that his hang ups about sex offer me a no win situation. In fact, a man afflicted with religious guilt, having multiple sex partners is showing disrespect for all the women he is in contact with.
Thanks for letting me vent!