An image that appears to be porn but is actually a photo of something else.
Bill: "My wife took some closeups of a flower the other day, I told her they looked just like her vag."
Mick: "Ha Ha, you must have a thing for pseudoporn!"
Eric: "I loved seeing your hot pussy on webcam, Jessica!"
Jessica: "That was my brother's armpit, douchebag."
Eric: "Oh no! I just tossed off to pseudoporn."