Some Americans’ idea of teen sexuality can be hopelessly black and white - either you’re a child or you’re not either you can legally consent or you can’t - and this simplistic, if well-meaning, hard line can end up hurting victims.
This guy is well aware that you are itching to leave childhood behind, so he’s offering you a way to accelerate that transformation. Authority figures who want to sleep with teenagers know all of this, and in fact try to exploit it.