He’s got the moves—maybe too many

I saw a great video on TV of a football player (actually was a professional dancer) performing in uniform with the cheerleaders. Great moves. Until he started with the crotch grab move. What's that about? It's been going on for years, with hip hop and rap and I see a lot of women like Miley Cyrus doing the "grab" too. Sometimes it's just a quick hand movement to draw attention to the area; sometimes with a thrust and a threat. Do they have the crabs (std)?