Wiz Khalifa -- Sex Tape With Playboy Model Is Off the Market

Sorry, celebrity porn fans ... looks like the tape featuring Wiz Khalifa and a Playboy model will not see the light of day ... because she's had a change of heart about selling it.

TMZ first reported ... Khalifa and Carla Howe filmed a home porn which Howe tried hawking, but Khalifa pitched a fit.

According to our sources, Howe had a meeting set with Vivid Entertainment -- which was prepared to make a big offer -- but she was a no-show.

We're told Wiz and Carla talked it out and eventually agreed not to release the tape. We don't know the terms of the agreement.

That's a little cynical, but ...