Support for explicit sexual content in public schools is the minority opinion. As such, it is up to supporters to present the case for it's benefits, and the responsibility of parents who hold those views to expose their children to descriptions and depictions of sexual acts.
I'm not going to dance this dance with you though. We both know that there are ulterior motives here that extend well beyond "sexual acts" and are absolutely about shaming or hiding the existence of homosexuals, trans people, etc. from teenagers for as long as possible. You're arguing from the position of their barely disguised pretense and literally no one actually believes that.