WWW- A sex tape featuring actor Tom Sizemore is on sale online – but his former girlfriend Heidi Fleiss says you should save your money.

Last week, xPays, the same company that let Web surfers hear the moans of Paris Hilton, started peddling footage of the “Black Hawk Down” star getting down with several women. Sizemore’s manager, Jason Tucker, says he isn’t sure how the tapes came to be sold, but he believes his client “has a legal right to some of the proceeds.”

“He’s not embarrassed by [the tape],” Tucker tells us. “Tom said, ‘It’s the maraschino cherry on the banana split that’s been my life.'”

What’s more, Tucker suggests, viewers will get their money’s worth. Portraying Sizemore as a reluctant superstud, Tucker says the “Saving Private Ryan” star, now in rehab, suffers from priapism – a medical condition that leaves his privates in a constant state of arousal. “He can have sex nine times without stopping,” Tucker contends.

Fleiss thinks not.

“He needed Viagra when I was with him,” the former Hollywood Madam tells us.

Fleiss also alleges the macho “Natural Born Killers” actor once invited her hunky ex-boyfriend John Enos to join them in a ménage à trois.

Enos, who starred on “The Young and the Restless,” says he turned them down.

“I’d rather be hit by a train,” he tells us. “What would I need him for, except to get me drinks and light my cigarette?”

Tucker denies there’s anything remotely gay about Sizemore, based on “the relationships that I’ve seen him in.” He also argues that Fleiss has an ax to grind, since Sizemore was convicted in 2003 of assaulting her.

Fleiss claims that Sizemore “has been trying to market these tapes forever. Nobody wanted them. Who wants to see him having sex?”

As for rumors that one Sizemore sex tape features Elizabeth Hurley, its reported the actress is not on the currently available tape, but adds that two more Sizemore tapes are said to “feature the actor with different female celebrities.”