I think the problem is we sort of expect parents to do that kind of thing - but most people I know have never really openly discussed sex with their parents, and if they did, it was once they were adults and had been sexually active for a long time.
I think it's better to be safe than sorry. And I do think too many young people are uninformed. Despite sex ed and biology I know a fair few people who think women pee out of their vaginas. Of course there's always a line to toe once you start getting into the arena of talking about relationships and more emotional topics, as frankly that's something everyone takes years to learn for themselves and you don't want people just pushing their idea of what it should be about. But I do think talking about consent is important and that some base ideas can be established, such as you should do anything you don't want to and you shouldn't make anyone do anything they don't want to for your sake.
I also think it is important to allow kids to ask their questions, and not make them feel afraid or embarrassed. To that end I think anonymous questions read out and answered is an elegant solution.