Sexual education should not be taught in kindergarten.
Would that also exclude teaching small children how recognise (risk of) sexual abuse?
No I don't really consider that sexual education. I was more referring to sex positions, nerve endings, secretions, forms of protection, cross dressing, and homosexuality. It's always good to teach of abuse.
Fair enough - the topics on your list are not what I would call essential kindergarden age knowledge.
Problem is that kindergardens don't operate in a vacuum. In the kindergarden that our oldest daughter visited (inner-city Hamburg), we got the impression that some of the other kids had already at home been exposed to hard core porn. Also, one of the girls there had a lesbian couple as parents. Now, if rules would be so strict that kindegarden teachers were not allowed to address such issues ("Sometimes, both parents can have the same sex., That is o.k. Stop harassing her for that") the rules could potentially do more harm than good.