These silhouettes look very much like the ones the artists in Montmartre still do today for the tourists. It only takes them a couple of minutes and they try charging a fortune for them. I am pretty sure that if you asked them and would not mind the cost you could still get this erotic silhouettes today.
I have no idea how the artists manage to do this. Please send me an email if you have any comments regarding these old erotic silhouttes.