I don't know about you, but at 11/12 I was taught pregnancy and shown child birth videos, taught about female menstruation (i don't know what the boys were learning, but they separated us by gender for some reason), and STD's - albeit all this 'education' was very bad, after the snickers and immature jokes it wasn't a terrible experience, if anything it didn't go into much depth, and it was literally a two time thing that happened in PE by teachers who were obviously not experts in that field.
There's nothing wrong with making sex education something that is normalised in school, and yeah maybe fetishes aren't taught to 10 year olds, but it becomes a regular enough module that by 15/16 kids are well aware of what they need to know about sex, pregnancy & STD prevention, abortion, childcare, masturbation, sexuality, consent, and yes fetishes.