So says a poster put up at bus stops in Spain (thanks to an American donor), complete with naked line drawing of prepubescent children (two shorter children with vulvas, one with long "girl's" hair, the other with short "boy's" hair, and two larger children with penises, again one each with the 'girl' and 'boy' hair).
I don't quite understand the obsession with small children's genitals; in my experience, children are relatively unconcerned until puberty.