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 porn 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."