“Listen up, slut. This violet wand is about to go up your ass. Why do you think you’ve got the gag on?”
From Ella Hollywood Gets Fucked at Kink Unlimited.
You just plug her in and turn on the juice. She’d scream, but the electrode in her mouth makes that impractical. After a few dozen orgasms, she becomes very biddable indeed:

Artwork is probably German.
The interrogation electricity is turned to maximum, but these nurses (and their nipples) are made of stern stuff. They aren’t quite ready to talk!

From National Lampoon.

This is a screenshot from a Japanese sadism movie called Pain Gate.
“I want to feel more connection with you in our sex life,” she said.
“I can make that happen!” he replied with an evil grin.
Image is from Infernal Restraints.
Begging will not save her tender pussy lips from the sizzling cattle prod:
From the Dofantasy sex comic Dark Vengeance IV, by the artist Fernando.
From Twitter we learn that Ben Franklin invented some sort of electric-shock kissing machine during his experiments with electricity:

Benjamin Franklin had couples perform an electrical kiss so “when their lips approach, they will be struck and shockt.”