One reason that isn't mentioned in the article is because the US is fundamentally based on puritanism and a lot of its values, especially concerning passion and sexuality are still prevalent in its culture.
The "All American" OJ and corn flakes breakfast and circumcision (used as a form of genital mutilation to prevent masturbation) by Kellogs is still practiced to this day. In the US, sex is heavily politicized.
On one hand, everything is hypersexualized, but there is nothing genuine about any of it. When you get to the basics of it — sex is wrong. "Look, but don't touch". Everything is relegated to the sphere of fantasy and imagination.
Especially teenage sexuality is something that's vilified to no end. You can't expect adults to have a healthy sex life if everything they know about sex so far is that it's some sort of forbidden fruit.
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Eh sure. Might be wrong. This is my experience with people I've interacted with.