Are Mason and Sklansky really friends?

[MikeR]

Or are they just business partners? Do they drink together, and go to movies and pick up girls with each other like normal buddies? I ask because in an older post the poster asked if Mason would publish a "How to Pick Up Chicks" type book if Sklansky wrote one, and Mason said that he wouldn't because it had nothing to do with gaming. I thought this made sense from a business viewpoint, but if my buddy wrote it, I would definetely publish it because we were friends. Does anyone know?