A sex tape starring Kanye West and a married 18-year-old "Kim Kardashian lookalike" is allegedly on the market — much to Yeezy's chagrin.

"With her bodacious curves, dusky skin and long black hair the woman is a definite dead ringer for Kim Kardashian," says RadarOnline.com, which claims to have seen all 20 minutes of the sex tape, "and can verify without a doubt that it is Kanye in the footage."

And they've got the screengrab to prove it.

The gossip site says the woman in the video tells Kanye she's 18 years old and in a sexless marriage. Seems legit!

Apparently the two get it on "in various positions," but "never kiss." Oh, and Kanye, who set up the camera himself, is wearing a condom throughout. Phew!

"The sex tape is being shopped right now and there's a lot of interest, but Kanye is freaking out," a RadarOnline "insider" is quoted as saying. "Kanye was practically in tears when he heard the tape was being shopped." Oh no!

Sex.com [NSFW link] has released a statement saying they've offered $1 millon in cold, hard, negotiable cash to the sex tape's anonymous owner for the exclusive rights to its hosting.

"By making a Kanye West sex-tape public, Sex.com feels that he and current girlfriend Kim Kardashian will become the first celebrity sex-tape power couple," the porn site said in its statement.

Ye is known for his strange affection toward Kim K's infamous Superstar sex tape, having incorporated it into his Cruel Summer collaboration "Clique." TMZ also claimed a source "with first-hand knowledge" told them Kanye used to use the sex tape while doing the deed with other women "to get him in the mood...and it always worked."

[photo via Getty]