Hip Hop Site to Chad Johnson Go Ahead, Sue Us ... Over Your XXX Vid

Chad Johnson's sex tape woes keep getting worse ... the former NFL star is suing two sites for illegally posting the video online -- and now one of 'em wants Chad to know they're not gonna bend over and take it.

TMZ broke the story ... a XXX video recently popped up starring Chad. He fired off a cease and desist letter to the sites that posted it -- including WorldstarHipHop. The sites took the skin flick down, Chad -- who wanted a pound of flesh -- filed a lawsuit.

A source close to Worldstar tells us ... when it came to acquiring the video, it did everything by the book after being assured it was being sold by the legal owner. Therefore, Worldstar contends Chad's lawsuit is baseless.

We reached out to Chad for comment -- so far, no word back.

Chad Johnson Sues Over Sex Tape -- My Johnson Comes With a Price

Chad Johnson's legal war over his sex tape isn't over -- the former NFL star is now suing two websites that posted footage of him having sex with a tattooed woman ... TMZ has learned.

Chad's lawsuit names WorldStarHipHop and Media Takeout, claiming the two websites posted the sex footage without his consent ... footage that was allegedly stolen from him in the first place.

Chad wants unspecified damages ... plus a court order blocking the websites from posting the footage ever again.

As we reported, both websites removed the tape last Thursday following Chad's cease-and-desist letters ... but Chad insists the damage was already done.

Calls to Johnson's camp weren't returned.

Chad Johnson Contacts FBI Over Leaked Sex Tape

Chad Johnson is turning to the FBI for help ... after a sex tape featuring the former NFL star leaked onto the Internet, TMZ has learned.

The footage shows Chad in a Florida hotel room ... doing the dirty with a tatted-up female.

Sources close to Chad tell TMZ, he's furious ... and believes the video was hacked from his phone -- much like Scarlett Johansson's nude photos. So, like Scarlett, he's contacted the FBI to help hunt down the culprit.

TMZ broke the story ... Chad admits the tape is real but insists he's not the one who leaked it. He says it was shot more than 3 years ago.

We're told Chad's still waiting for a response from the Bureau -- but he's not sitting around ... he's contacted his lawyer (who deals specifically with cyber crimes) to put together a cease-and-desist letter to get the footage yanked from the web.

Chad Johnson The Sex Tape is Real ... But I Didn't Leak it

Chad Johnson acknowledges ... a sex tape which appears to feature the former NFL star -- along with TWO female friends -- is REAL ... but Chad insists he never wanted the footage to go public.

Sources close to Johnson ... ha, Johnson ... tell TMZ the tape was shot roughly 3 years ago in a hotel room in Florida.

We're told Chad has no idea how the tape leaked to the Internet ... but insists he wasn't behind it ... and now he's exploring his legal options in hopes of having the tape removed from the web ASAP.

So far, it doesn't appear the entire video has made it's way into cyberspace -- only bits and pieces -- but we're told the entire tape is "substantial in length" ... ha, substantial in length.

We reached out to Johnson's lawyer -- but he had no comment.