My wife and I still have great sex, and it is much better since she has been with other men often in front of me.  When she told me she needed to experience other men, and it looked like we were heading for divorce. She said she still loved me, but was not fulfilled, and I certainly still loved her. So it seemed stupid to divorce, and after some in depth discussion. We agreed to stay together and I would accept her having sex with other men. This saved our marriage which is better than ever. She is not cheating as I have agreed and everything is in the open. She tells me about every man she sleeps with and does sometimes bring them home and also has gone away on weekends with them, and one of them is now a good friend of mine also.  I have not felt I was missing anything in our marriage, and been very happily married with this arrangement for 12 years now. The absence of jealousy is so liberating for both of us. I guess it is probably a polyamorous relationship.  So please don't destroy a marriage without looking at ALL the options.