If you watch one of his earlier projects(Besides GOONIES that is!:rolleyes)
You can see him in TOY SOLDIERS, and there is a scene where he is in a towel after coming out of the shower.
Then again, it was a poor quality movie, so it could've been anything.
But consider that he is the offspring of John Astin, so it could be 50/50.
I loved watching Toy Soldiers when I was little just to be able to see his naked ass. I was so in love with Sean Astin back then. I was just watching The Goonies on T.V. yesterday and he's adorable in that. In fact, seeing him in that movie when I was little is what first made me fall in love with him.
i loved him in 50 first dates with being all bulked out wih muscles