Aunty Marlena discovered that Geschlechtertausch (Gender Swap) is a popular event among students in German high schools and she sent me a load of links showing examples of German boys and girls as girls and boys on Gender Swap Day. Instead of listing all those links, Google Geschlechtertausch yourself and Google will turn up hundreds of images for you just like the ones below.
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Femulators competing in the 1974 installment of the National Cotillion.
Wearing Delphine Manivet.