keep a sock on it

Mr. Beefcake was young and hot and liked to look good. Ms. E knew he was a hot piece of meat, but realized the boy was not the sharpest tool in the shed, nor was he saving for the future. Nevertheless, she enjoyed their romps and was planning on continuing to play with him for a while more at least. One evening he told his lady, Ms. E about his tanning experience. He was describing details of how burnt his bum had become.....shocked, she asked, "you go naked in there?" and he said, "yeah babe, I don't want tan lines." She ponders for a moment, still staring at his perfect chest, and proceeds to ask, "well what about that," pointing to his manhood. He says, "Oh, I put a sock on it." Simple enough! Who said the beefcake was not smart??