It takes a very special man to get into a really good MMF. <sighs>
If either of them are at all squeamish about having any sort of contact, particularly accidental (which I assure you is inevitable) it sounds like he may not get any enjoyment out of this
Multiply this by 10 if they are both this way.
Their balls will not only be in the others face..they will be bumping on each other if you get into a DP and there's really no way to not going where the other cock has been previously.
Then there is the cum factor!
My dear, you need at least two men with a "let's pleasure the wife all we can" mentality to pull this off....if that is their real motivation...they will be randy as hell and will not take a care to any of it...and all of you will all have a splendid time indeed!
To answer your most obvious question about what the guys do in an MMF...they poke you, prod you and ply you with pleasure in every way they can think of. <sighs>
My kind of play, btw.
;-*