I've only done the MMF thing once, while I was enjoying being single and unattached for a while, it was a lot of fun having two people go for you :-), but not something I would do with anyone I had feelings for - I'm too jealous for that!

I did get the feeling that one of the guys enjoyed it more than the other though, it's not something everyone is comfortable with, and when one of the party isn't, it kinda ruins the tone a bit.

Still, if everyone is comfortable with it (this thing wasn't planned, just 'happened' then I guess it could be a lotta fun.