Women and M F M 3/somes!

Reading through this and other forums like this there are a lot of guys (I would say around 70%) who would like to (and some lucky ones) who have, "including me") see their woman going with another guy in a M F M threesome situation.
But what about the women?
Are their women out there that would like to get involved in a M F M threesome situation with their guy and don't know just how to bring it up with their guy?
Are you one of these women?
Have you bought up "or hinted around" the subject with your partner at all?
Have you bought it up and gone through with it?
Any guys out there who's woman has bought it up with them and what were the results?
Just curious, there are a lot of M F M 3/somes going on out there and would like to know just how they were started!