I'm sorry, but the idea of having an mmf threesome is pretty hot. I would never tolerate my wife/girlfriend having sex with another guy behind my back, but if we took turns penetrating her while the other guy was kissing her neck, sucking on her tits, sucking on her tongue, etc while she was rubbing her clit? I'm down. lol
I've actually asked girls about threesomes before, and they usually say "NO." When I mention the above scenario, a lot of girls say "Wow. . .that actually sounds hot."