A few times for me, both MMf and FFM.
The first time my (now ex-) wife had been out drinking and dancing with one of her girlfriends (I’ve never been much for either).
About midnight they came back, and they were both a little tipsy. We all sat around talking, and the talk turned to sex. Suddenly, my wife blurts out she always wondered what it was like to have sex with a woman. The girlfriend says “Me too”. We all kind of looked at each other for a minute, and then the wife gets up and kisses the girlfriend. They tell me to wait there, and they hit the bedroom, and after a few minutes I hear lots of moans and groans. They called me in about 30 minutes later, and we all had much fun!
Over the course of the next few months, we tried FFM two or three more times, with different women. Then one night we were at a party where the host was a guy we both knew very well. After everyone else had gone home, the three of us all got in the hot tub, and since we hadn’t brought any suits, we were all naked. After a half hour or so, the flirting got a little more serious, and then she grabs the other guy by the horn, so to speak, pulls him up on the side of the hot tub, and proceeds to, ahhhh…. wet his whistle. While doing that, she told me to get up behind her, and who was I to argue? Again, much fun was had by all!
Over the next year we had several more threesomes with the same guy, a couple of foursomes when he had a willing woman there, and we swapped with him a couple of times.
All in all, I liked the MMF better, mostly because the (now ex-) wife enjoyed it so much. Plus, as much fun as two naked women are (which is a bunch of fun!), one guy trying to keep up with two horny women is pretty much a lost cause. I damn near wore the little guy off a couple of times trying to keep my end up, if you’ll pardon the pun. And the ex absolutely loved being sandwiched, she would orgasm a dozen times in a row.
Ugly