I don't see a problem with it. Kids will learn about things eventually. Might as well teach them in school, that you should always have safe sex and that things such as "oral" and "anal" sex are still types of sex. And the dangers that come with these things. And like the video said. If you just look at the poster without context, of course it looks bad. But if you take it in context of the class, it's not that bad.