Having done the MFM thing, the attraction for me was the desire and 'perversion' of the woman. She wanted it to happen, so as a nice gentleman, I helped make it happen for her. I would assume the MMF situation is the same.Ok, I won't make any comment on any perceived "gayness" of this. But personally it has absolutely no attraction - even to watch porn with this type of activity. I have never been in a situation where I'm having sex with somebody while thinking "Gee, this would be even better if there was another guy here to stuff his unit in there with mine and share the experience". Even a threesome with another guy is just not something that interests me - whereas threesomes with two girls is great. I understand that MMF might be a fantasy of some women - but why would a guy want this? So if there is anybody out there who is into this, please explain the attraction.
I have a feeling that true hetero MMF is extremely rare and happens mostly/only in the movies... Cash is King.
Two mushrooms touching is just the same as a fist bump.
(FWIW, I've never even been close to a FFM or FMF threesome situation. I have no idea how this naturally happens)