justsomeguy if the jealousy factor is there at all it usally doesnt work out . If you are not thinking she is so hot while doing that, it will cause big problems. I watched a couple married for 15 years hardley ever fought they told each other about there fantasies for years then got a chance to go to a swingers party he got so jealous in the middle of it he got in a fight.(hit a guy in the face ruined the whole party) Sometimes fantasies are best left as fanasties.Or you may want to start out with another women as this is easyer for some guys to watch their wife with another women first then maybe later you can work your way up to a mmf.What ever you decide make sure evryone understands things going in and anyone can end it at any point