Kids aren't asexual, and then BOOM they're sexual the second they hit 18. I was very interested in sex from an age that would make most people deeply uncomfortable to think about. Romeo and Juliet laws exist because we recognize that first, kids are going to be sexual, and second, it's not always going to be with peers that are exactly their own age, and that prosecuting minors for statutory rape--since neither party could legally consent--is a little crazy.
So there needs to be some kind of line between recognizing that kids are sexual, and adults not treating them in a sexual way.
Clearly what we need to do is a bunch of gene editing so that humans go through a cocoon phase where they sexually mature and emerge as a fully-formed adult.
One could argue that sexualizing minors goes against cultural norms instilled as policy. Which, I dunno, even thinking about this puts me into a position where I am implied to defend truly horrible people.