You might be surprised what is reaction would be, a lot of husband's to want to be the one to bring it up first because of the backlash from our wives if she disapprove, but I think ladies can introduce the idea during sex and if he barks at the idea, then drop it. But most of don't mind it.It's not something I ever considered too seriously before, but having been in the same relationship for a while now, it starts to sound more appealing. I think I would be OK if my SO was with another woman, as long as he didn't get her pregnant somehow and I was there with them when it happened. And if he asked me to service another man, and if it was someone I found attractive, I would be willing. I just don't think that is likely in his nature and there are a lot of "ifs" involved. So most likely I will have to make do with my fantasies involving other people and leave it at that.