A-Lister's Secret Sex Den Exposed! Inside The Kinky Hollywood Club

Dozens of horny household names are getting their jollies at a notorious Hollywood sex club — and RadarOnline.com can unmask the lusty A-listers partying at the passion pit!

The X-rated flesh palace, known as Snctm, hosts monthly sex parties for Tinseltown heavyweights, jet-setting models and wealthy swingers.

In a blockbuster investigation, RadarOnline.com has learned bisexual beauty Angelina Jolie, her ex Brad Pitt, goody-two shoes Gwyneth Paltrow and tart-tongued cable TV talker Bill Maher have indulged in its pleasures.

Just months before they split, sources said the Mr. & Mrs. Smith stars hit the club where guests wear masks to conceal their identities, like the Tom Cruise and Nicole Kidman soft [expletive] flick, Eyes Wide Shut.

"Angie had started coming in alone," an eyewitness tattled to RadarOnline.com.

"Angie requested that a girl wear a strap-on, while another girl tickles her female parts with a feather, while Angie gives a guy oral sex!"

Paltrow and her Glee-producing boyfriend, Brad Falchuk, are regulars at the den of iniquity, insiders revealed.

"She owns a popular blog, and she interviewed the owner. If you dig a little bit you will find that she and her boyfriend were there," a second source told RadarOnline.com.

The blog post about the club and its owner, Damon Lawner, was promoted in the sex issue of Paltrow's website, Goop, and featured a $15,000 gold-plated sex toy.

The blog gushed: "Most guests stay within the confines of their coupledom, but find that the voyeur component adds a level of fantasy that they don't find in their own bedroom."

"What does seem refreshing, though, is that women set the tone: Besides being dominant in numbers, they are the ones who are allowed to touch and initiate..."

Highbrow guests pay to attend "erotic theater" events, usually held in a Beverly Hills mansion, but must pass a rigorous screening process before rubbing shoulders — and other body parts — with other titillated guests.

Premier memberships cost up to $50,000 and allow access to secret themed playrooms.

Famous celebrity guests include two Hall of Fame rockers — one of whom is "very married" — and political commentator Maher.

The 60-year-old comic is a frequent visitor at the Playboy Mansion and is known for his super-stud libido.

In her scandalous book, Confessions of a Video Vixen, party girl Karrine Steffans gushed that making love with Maher was "explosive" and "amazing."