I think the Weasley twins need to develop it (by accident perhaps) and Auror Harry uses it on Auror Draco in a meeting as a prank. Draco retaliates in kind. Etc. etc.

Hey, I wonder if the orgasms are better as you get better at the spell?
"You're pretty good with your wand there, Potter."
"I've been practicing."
"Had to do something to make it up to your lovers when your.. ahem... OTHER wand failed them?"
"Get over here Malfoy and I'll show you just how good I am at casting a natural Orgasmo!"

XD