Share 'Put down your junk'

Help me people. My 5.5 year old keeps grabbing himself. Like a mini-Michael Jackson doing choreography, all day he idly reaches down and grabs himself. How do I make him stop? Is this normal? Why is he doing this? How do I make him stop? For the record, talking about why has made no dent. Reminding him each time has had no effect. Taking away a toy each time he does it has not helped. Chastit…