I agree with BM 100%, you need to stand up girl - get a backbone and say that this will not stand and you will have nothing to do with his behavior.
Let me ask a question, does he know that you know that he has an OW ? Have you ever talked about the OW, does he admit it and just continues.
A little confused here, if you could shed some more light on that it would be helpful for us, who care, to give you our thoughts and encouragement.
I am the husband here, married for 33 years. So if nothing else I can offer some perspective from the H point of view. Also, the sex thing has always been an issue for us, so I have some thoughts on that topic too if you like
Mr. FL
M-58 W-56 Married 33 years BOMB -Sept/10 Separated 8 months
BITS (of Fruit) Firstlove
"Go Confidently in the direction of YOUR dreams - Live the life you've imagined" - Thoreau