Had Beamer neutered a few months ago. He is just as lovable and playful as ever. Someone told me that once he was neutered he would be more lovable and wouldn't "mark his territory" the same.
Well, I don't think it was possible for him to be any more lovable than he already was. But he still marks his territory! Usually right by the bathroom door. (although the little stinker went over to Lil Bit's bed the other day and marked his territory on that, had to put it in the washing machine).