Wife doesn't like anal, so it's DV with her. I'm happy do do the traditional DP with other swinging friends. Double-entry is not a usual event when we swing - perhaps once every 6 times or so, and most usually neither of the guys cum, it's just a sexy game in between one-on-one fucking. Have tried it with the woman in reverse cowgirl but it's awkward, so our standard way is for the wife or other lady to ride me cowgirl style and the other guy to go in next; I'm usually in first because of my size. The guy on top has to do the fucking as I find it hard to move underneath. Some men won't do DV because they think cock-on-cock is gay, but I love the sensation, especially on that rare occasion when one of us men does cum and particularly if we're both bareback. Don't do that so much now, usually you fuck your own woman bareback and the other guy wears a condom.
My wife likes it very much - she says it's not so much the feeling but the excitement of being used by two men together.