Three's a Crowd?

Is having a threesome an ivory-tower dream that all men have? I don't get it. I mean, if it happened to me, it might be kind of cool, but I don't wish for it with stars in my eyes. Boo has participated in a threesome before, and he STILL wistfully comments about having one (or several). Sure, I've had fantasies about some serious DP, but probably not enough to want to go through with it. I just think threesomes are overrated. Three people trying to get it on together makes things confusing. Then again, I've never actually participated in one, so maybe I don't know what I am missing?