I had a provider once ask me if I would be interested in participating in one with her. Totally her idea as she LOVES to be spit roasted.
Hard to say no while your balls deep in doggie and she's reaching around on the bed for a toy to stuff her mouth with. Too bad she lives about 1,500 miles away and we only can meet once or twice a year. Personally a FFM is quite enjoyable, but a MFM would definitely require the right circumstances and people to be comfortable. But hey, I'm game. Only get one pass at life, right?
3-parties are incredibly edgy sexy hot. MFM is the hottest when I know the woman and love seeing her arousal and super sexiness. Very Hot flooding her with love and attention. So super Hot seeing and feeling her arousal go on and on even as my own goes through "ups and downs". Absolutely the best with my SO. Also, excellent edgy being the "3rd" with another couple. Definitely experimental if the three parties don't really know each other. Yeah, I dig it to the max.
I don't see it as having to share. I see it as watching her having to take cock and get pleasured immensely which is a huge turn on to me. I love watching a hottie with her fuckface suck my cock while her tits are flying at me because she's taking it from behind doggie.
Did a spit roast with my GF and her former BF. We each just focused on our respective "ends" of the lady and took turns on each end back in the days of bareback. Would love to try spit-roasting my ATF sometime