No, I definitely don't see it as a moral issue. Whether a boy or a man choose to completely fuck up their own lives is a purely social issue in my eyes.

Now I would like to make a direct assertion here, but I can't for the life of me tell whether you are an antisocial freak or whether there's something I haven't considered here. If whether sex is worthless is the decision solely of the participants, then is it ever reasonable for someone to get the perspective of their friend on whether having sex with another person would be shallow or worthless?

And if whether sex is worthless is the decision of the participants, is it possible for one of the participants to conclude after the fact that they made a huge mistake, and that they made an objectively bad decision choosing to have sex previously? And if you asked that person, do you believe it's possible they would give reasons for their conclusion that would be relevant for anyone in a similar context?

These cases all seem very reasonable to me. The only time I can see someone denying all these cases is if they were insecure about when they choose to have sex, and didn't want people to challenge their opinions. What did you mean when you said the decision is the right of the participants?