I Had An Affair Forum & Chat Board | Sex Addict-Should I allow a Mistress?

In dating my now husband, he cheated on me with his ex-wife due to his butt fetish sex addiction. We took a break, he dated around and to prove he was over his ex, just not the fetish, he slept with a prostitute.  I thought we moved past it all and we began dating, were having a good sex life ect.  We got got married after the second year. Now four months in, the fetish addiction is coming back as he is stressed about problems with work and the ex-wife taking him to court. He is a wonderful father and loves his two daughters that he has full custody of  as well as being a part of a family as much I do. He has been depressed and moody lately though. The other night he told me he is struggling with the fetish and doesn't want to hurt me. He asked about taking a mistress and I am not sure I can handle that given everything. I told him I suffer fron low self-esteem now and feel broken, which I am afraid will drive me to seek that missing validation from another man. He reassurred me that he finds me attractive and sexy with my petite frame, natural large breasts, and pear shape, but he has a fetish for a large butt that I lack. He wants the endorphin rush that comes with that to releave his stress. I am trying to think of a way I could keep our family and let him be happy. I am thinking of trying for a baby with him as it would be something to distract me, a person that is part of us that I could watch grow, and it would keep him from leaving me as I know he would not give up his child. I know that sounds wrong, but....it is a possibility. He suggested surgery for a butt enhancement, but I have my reservations. I'd rather have a baby.