Charcoal rubbing? That’s almost as bad a lube as sandpaper.
Have you ever tried to send out dirty cave paintings?
Kids today…
Regards,
Shodan
In my day all we had were black & white line drawings, but the tweets are more effective.
Dictographs?
Here in the Southwest, it’s not unusual to see peteroglyphs on canyon walls.
Great. Some randy teen draws a phallic symbol on the wall as part of some juvenile humor, and 7500 years later some archeologist comes up with an elaborate explanation of a fertility religion of this clan.
Still better than what the Egyptians had to work with. I mean, how can you expect to carve a stele depicting your erect wang before it… doesn’t comply with the original modelling specs anymore ?
And thus was born the legend of Kokopelli!
Some great moments (though a bit totally bogus) in the history of sexting:
Aaron Burr used to hire miniature portrait artists to make oil locket paintings and give them out to various ladies when he traveled on government business. This notion of “a picture of my junk for thy locket” is where we get the word “junket” for political travel.
It was when Alexander Hamilton said “Me thinks it not a miniature portrait artist but limner working in actual size” that Burr challenged him to a duel.
First sentence transmitted across the telegraph: “What hath God wrought/STOP”
Second sentence transmitted across the telegraph: "Dunno. Got something feels like ‘wrought’ iron that’ll make you say ‘oh God’ though. 
/STOP/
The entire reason Benjamin Franklin became a printer was when an engraver who owed him money did a brass etching of his member. The printing press was the best way to send it out en masse.
Matthew Brady is mainly known for his U.S. Civil War photography, but few remember that he got his start as D.C.'s primary porno photography, pioneering the photographic art form known as Dickeurrotypes.
A surprising (to me at least) number of Dopers have done so.