Hugh Hefner and his girl friends?

Does he sleep with all of them or just Holly? I love the show the girls next door but I always wander what goes on behind closed doors. I could not be with a man who had two other girl friends especially if he slept with them. Holly is so sweet and wants a baby and really loves Hugh =) I wish he would just dump the other two. Especially Kendra. She doesn't fit in, in my opinion. Shes too butch and not as sweet. What are your thoughts on this? Does he just have the other two girls for show? Are they allowed to date other men?