In Harry Potter, everybody can potentially know every other persons body in detail, since there is polyjuice potion. I bet in the harry potter world, there are illegal celebraty dna markets, where you can buy hair from the star you are atracted to and than your girlfriend can drink the potion. These are some weird implications I never thought about before.
Bonus: I am rewatching Chamber of Secrets at the moment - isn't it super weird that Salasar Slithering built his little secret hiding place directly under the girl restrooms? There is this "The Rock"-meme where he pulls his glasses down: this would fit here so well.