I will be honest in saying that if I was to have a MMF,It would not personally bother me if a lady were to put my wang and another guy's wang in her mouth at the same time,infact for some reason I find it kind of arousing because of watching the girl suck both at them at once.I don't think there is anything gay about that,it shows I am comftable with my sexuality and am straight.It wouldn't bother me if my dick or shafts were touching each other in her mouth.But I would draw the line of having some dude cumming all over my dick,and also wouldn't wan't the lady to rub both dicks together out of her mouth as it wouldn't give me any pleasure