I had that done to me few times, I just go on top of my husband 69 and have hubby fuck me doggy style. I also like the reverse cowgirl position while my husband lick my clit.
In my MMF 3somes my top of the list is DP and have both men cum inside me at the same time or very close to each other and second on the list is what I said above and it can be extremely nice when hubby cum inside while my husband is licking me.
As for the two guys not touching, well sometimes its unavoidable and depends on the position.