A long time ago I linked to a quirky old illustration of a man spanking a woman during rear-entry sex. Now I’ve stumbled over another illustration from the same (unknown to me) artist. This one’s more severe, showing a woman being whipped by an “interested” bystander while she has rough, getting-bitten sex with another man:
What makes this illustration more intriguing is the open door in the backgroud beyond which shadowy figures can be seen observing the action.
Found via alt.binaries.pictures.erotica.cartoons.