Farrah Abraham Sex Tape

Farrah Abraham was gettin' super hands on with one of the biggest male porn stars in the biz yesterday ... James Deen ... fueling rumors that he's the co-star in the "Teen Mom" star's sex tape.

Farrah and James -- who, along with having genitals that resemble an elephant trunk, once starred in a mainstream movie with Lindsay Lohan -- were photographed walking into the offices of Vivid Entertainment yesterday.

The two were holding hands ... but it's unclear if they're dating ... or just simply friends with professional benefits.

Farrah previously told TMZ she's AGAINST the release of the tape and is considering legal action to stop the footage from going public.

Former "Teen Mom" Farrah Abraham staunchly denied the existence of a sex tape ... and then flip-flopped ... and then threatened legal action ... and then said some REALLY dumb stuff ... and TMZ caught the whole thing on tape.

21-year-old Abraham was shopping for sexy lingerie at Agent Provocateur in L.A. yesterday when we asked if she knew about the existence of the sex tape being shopped around town.

"I don't ... exist ... anything about that," Farrah eloquently told us.

Farrah later changed her position ... saying, "If I had my own personal stuff, that's my own personal thing."

During the encounter, we learned Farrah doesn't know the meaning of the word, "elaborate" -- ya gotta watch the video.

"Teen Mom" Farrah Abraham got down and dirty while cameras rolled and now a sex tape is being shopped to various porn companies featuring the MTV star ... TMZ has learned.

According to sources who have seen the tape, Farrah and a male partner (possibly her ex-boyfriend) go at it for about 30 minutes ... full-on sex ... in various positions. We're told it was recently shot.

Our sources say the person selling the tape has already shown it to some of the biggest XXX companies and is looking to make a deal.

It's another notch in Farrah's belt ... she was recently snapped boozing it up in nothing but lingerie. And last month she was arrested on suspicion of DUI, when cops say she blew nearly twice the legal limit.

Farrah blamed that on being sick. Wonder what her excuse for this will be?