The Girls Next Door

I hate to admit it, but I'm completely fascinated by this show. (For those of you who don't know, its a reality show following around Hugh Hefner's 3 live-in girlfriends). Its like a car wreck. I don't WANT to watch it because I can feel brain cells disappearing by the second, but I just can't stop. I'm dumbfounded by the relationships. I constantly am wondering how it "works", how the girlfriends get "picked", why someone would want to be in that situation . . .