imagine your standing in front of loads of people in full view (ie,stage or lecture or demonstration kind thing) and you had itchy privates or your bits aint tucked in proplerly?? whadda you do? do you scratch and hope nobody says anything or do you wait until your out of sight??
As the legendary Billy Connolly once said ... Shout out loud, ''My (whatever parts) are really itchy and I'm going to scratch them now''.... you'll find 99% of people will look away, problem solved