Turkey Tap... Evidently, it's a thing. It's the act of tapping your hand against another guy's package (aiming for the balls) as you pass by,
whether clothed on the street, or naked. And, evidently, it's a straight guy thing. Is my imagination, or are straight guys finally beginning to thaw and figure out that another man's cock isn't anything to be afraid of?
Or, is this some kind of signal to other dudes that you'd be up for some fun?
Dad wrote in again with another round of thanks to all you readers. He took your advice and allowed his son to have his buddies over to the house. As the majority suggested, Dad stayed around long enough to meet his son's friends, and laid down some rules: No booze, no drugs, and they were to clean up after themselves. Then he told them what time he'd be back, and turned to leave for the evening. Just as a joke, he turned back to them and added, "No cum on the couch," and left with his son's groan and "Dad!" ringing in his ears along with peals of laughter from the guys.
He returned a bit later than planned. Only two of his son's friends remained, playing some X-box video game.
He chatted with them for a couple minutes, and then went to bed. He woke the next morning and poked his head into his son's room as (he says) he's done since the kid was born. All three were naked, sound asleep on the bed.
He closed the door and went about his morning. When the boys emerged, he made them breakfast.
From my perspective, that experience helped him understand that he could trust his son alone in the house. And the boys learned that guys being naked and being naked together is perfectly natural. They've nothing to be ashamed of.