Though we are justifying it to ourselves as protecting our son's privacy, but a big part of not wanting to tell the parents is that we do not approve of how we think they wish to parent their son.
I think it's way too old for sex-exploration playing-doctor type behavior.
The father summons each girl in military fashion to take their punishment and whips them mercilessly.
I too would also worry about him or any boy or girl, at this age manipulating another for their own pleasure.
I think you need more information.
I would continue the openness and try to make him understand that sex is something you do when you have a committed relationship it is not a thing to do with your pals.
Does anyone have any insight about the predicament? And it worked to draw viewers to the show.