What people do upon age of consent is none of my business. And, the Thought Police to the contrary, what I think about it is none of theirs.
Parental rights trump the State in these matters.
Natural Law is the foundation of our Constitution ("the Laws of Nature and of Nature's God" and our Ninth Amendment).
The first law Natural Law is "Eat, Survive, and Reproduce".
Thus, we have a right to make a living (free enterprise as versus permission required by the State).
Thus, we have a right to defend ourselves (e.g. the Second Amendment)
Thus, parental rights. Parents have a right to assert the rights of their minor children as they see fit in pursuit of their happiness.
The fundamental problem in the issue at hand is that the State is asserting primacy-- witness the statement in debate of the previous governor of Virginia which cost him re-election, witness the statements of public teacher unions, and the Woken Dead in general.
This is deeply wrong.
In the ontogeny of humans, pre-pubescent children are wired to receive the culture into which they are born. The State does not have the right to inculcate ideas about the role and nature of sex/reproduction; the State does not have the right to sexualize children-- particularly with an ideology based around "Man is God" and can undo what Nature has done.