where demonstrations for the purpose of modeling proper sexual technique, safer sex
protocols and better communication are performed usually for a live audience who's encouraged to watch and ask questions. Demonstrations may or may not include nudity or explicit sexual contact, but often do.
"Show-n-Tell Sex Ed is such a better way to learn how to be a sex ninja
than watching porn."
"I went to a Show-n-Tell Sex Ed workshop where the sex educator totally
hand-fucked a melon with a latex glove
and some lube
workshop was a Show-n-Tell Sex Ed class and they pegged
a dude in front of me and my gf