Affiliate Marketing Secrets

I’m writing a novel, and I keep wondering, is this type of theme really so needed?
Teenage romance, s*x scenes, high school drama..teen stuff like. Now, I can hardy pick up a book from the bookstore that don’t possess these. It probably sells, but sometimes they can be too heartless and pointless. You can barely feel the emotions. The romance in my story isn’t the superficial type, they take time to develop and doesn’t feel the need to snog at every other page, they show their feelings through actions and encouragements not affiliated with s*x scenes and whatnot. It won’t probably attract lots, but it at least seems real. But why do they appear in nearly every new novel now?