French postcards

Wikipedia quote:
A French postcard is a small, postcard-sized piece of cardstock featuring a photograph of a nude or semi-nude woman. Such erotic cards were produced in great volume, primarily in France, in the late 19th and early 20th century. The term was adopted in the USA, where such cards were not legally made

https://en.wikipedia.org/wiki/French_postcard

Additional to Wikipedia I have to mention also some cards with nude or seminude men exist from this early days of photography.

Personally I've seen a few normally used on auction sites as Ebay or Delcampe, searching for erotica, all of this from French Colonies in Africa and Oceania. Here's a link to a collection on xHamster:

http://xhamster.com/photos/gallery/527826/vintage_african_postcards.html

How is it today? I've send some nude photo postcards from Domburg/Netherlands to Western Germany, they all arrived!
No problems, human nudity is not i l l e g a l anymore in civilized, progressive countries ;)

But better don't try it in sex hostile countries, you would end up in jail in such states as Saudi-Arabia, Iran, Pakistan and the ilk...