a civilian i know .. she wants to do a MMF  session ..   any other gentleman who is totally straight experienced this ... just wondering if any suggestions as to how to handle.    thanks.  

It's not a rule or anything, just a clarifying convention, but ...
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MFM implies two straight guys sandwiching (or spit roasting) an F in between.
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I sometimes use M----FM to imply that the Ms stay far apart while the F interacts with them one at a time with no close touching / overlap.  M---FM (switch) MF----M (switch) M---FM ...
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MMF implies that the middle M is taking it from the M and the F in as many variations as you can imagine:  
the MF could be BJ, Vag, Anal or M getting pegged or who knows what
the MM could be BJ (both ways), Anal (both ways) or who knows what
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If there are any takers, you'll have to be sure about who is expecting what (ahead of time).

So she wants the males to play with each other? Being straight I don’t see how that works. I’ve done MFM a lot at swinger parties. I had a hot wife who wanted to have her husband suck me off. I wasn’t comfortable with that. He did eat my cum out of her pussy though. Guess you need to get everyone on the same page.

…that she didn’t mean MFM.  Maybe she mixed up the letters.  Just sayin’

Everyone seems to be fixated on the placement of the letters.  He probably just didn't know the different connotations because in the same sentence he asks about "any other gentleman who is totally straight experienced this."

Because it matters significantly. Maybe one of these guys doesn’t want a dick in their ass or mouth. Hence mfm or mmf. Just like fmf or ffm

Of course that matters  What I'm saying is that a civvie asked him about a 3-some.  We don't know that she said, "MMF."  LIke a civvie would know the difference anyway.  It's quite possible that she said that she would like to do it with two guys, not even implying that one of them was bisexual.   Never Too Large, took that information and ran with it not knowing the difference himself.  Until we have heard from him to clarify this, we won't know for sure.

Who told you that?  It's kind of weird, don't you think?  

Who told me? If it was second grade, Ms. Kennedy told me.  If it was third grade, then Mrs. Anthony told me.  Heck, I might have learned  "i before e except after c?" in first grade.  That was 60 years ago so can't say precisely.    A lot of weird things about the English language though.

thank you for the abbreviation education ..  i guess MFM would be the more accurate application =  two guys satisfying the needs of one woman.

Is she wanting to do this with you? Find any swinging site and it’s easy to find another dick.

yeah but i prefer and know she does as well, someone she has already played with.  

I saw the "totally straight" part, too. Some people will not read past the subject line ("MMF? Eewwww..."). I think that most of the replies, yours included, are just trying to be helpful to the OP and let him know the (unofficial) convention for his future posts (or emails or whatever).  If he doesn't get the replies he hoped for using "MMF" he should switch to "MFM," if that's what he meant, in future posts.

If she wants  a dildo and me ,am fine with using one on her.

their own bisexual feelings, so they think by having a woman in the room, they can get the action they want with another guy and say it was something else.  Some guys are straight, some are gay, and others are still trying to figure it out.  MFM seems like a safe way to explore which group you are in without outing yourself inadvertently.