When Terry Gross interviewed Jay-Z on "Fresh Air" a couple of years ago, she asked why hip-hop artists are so fond of grabbing their crotch. He actually gave a rather insightful response. He pointed out that while most rock artists start out playing small clubs and move to progressively larger audiences, rappers go from performing at small clubs and then hit it big and end up playing in front of huge audiences without any real transition. They aren't really showing the ladies what they have to offer as much as they are covering themselves up because they feel exposed. That could totally explain why some boy band that went from obscurity to playing SNL would be clutching their junk.