My husband and I are advid swingers and have threesomes on occasion ( about 8-10 times per year) of course this is with a good friend of ours. When and where they happen are almost alway partialy planned and then agian sometimes spur of the moment.....I am openly Bi and with having a threesome I am able to be with another women and enjoy that, while still being able to go home with my husband and have a very fufilling relationship. But I can say that my husband also loves the whole situation of having a threesome with another women. As far as a MMF situation goes I have not experienced that one yet (hubby is not in to that one yet,lol) so I cant say how that would work but....I would assume that it would be about the same. Hope this helps!