(Sex acts up the wazoo, so very much not for kids or the sexually modest.)
Passed on by Gregory Ward, this entertaining Onion video “This Day In History: The Invention Of The Handjob”, in which
Handjob inventor Fred Gilgoff describes the inspiration for the two-person masturbation technique [invented this day 60 years ago].
The conceit is that the hand job technque was devised, much in the way that the Heimlich maneuvre was devised, and that before Gilgoff’s great discovery, people had no effective technique for manually getting one another off. (According to the video, the hand job breakthrough was followed by a string of others: the blow job, the rim job, and fisting.)