For me, if either my husband or I suggested an open marriage, it would be a big red flag. An open marriage seems to me to be a contradiction in terms. If you don’t value exclusivity, it might not he a good idea to get married. Of those I’ve known who tried it, or a least thought about it, one partner is usually the driving force behind the decision and the other goes along for fear of losing them. They nearly always do anyway. I imagine rare couples might be able to make it work, but for most, I think it’s a bad idea. The thought of bringing someone else into an intimate relationship with either me or my husband is repellent to me. I wasn’t keen on dating when I was single. I certainly wouldn’t want to do it now. If my husband died, I still wouldn’t want to. It would have to be someone very special to get me to change my mind.