Holly Madison dished out on Hugh Hefner's alleged sex secrets in her new book, "Down the Rabbit Hole: Curious Adventures and Cautionary Tales of a Former Playboy Bunny."

According to Hollywood Life, Holly Madison revealed in the book that she was purportedly rarely alone with Hugh Hefner during sexual encounters. The Playboy playmates allegedly took turns having intercourse with the Playboy owner, but the publisher allegedly "always finished by himself."

Holly Madison also revealed that Playboy playmates would have "fake f***" sessions, wherein Hugh Hefner would "watch porn, smoke pot, and masturbate while his girlfriends, and whoever else was in the room, pretended to get it on around him."

Holly Madison, who appeared in 2005-2010 reality show "The Girls Next Door," also reportedly recounted her first time inside Hugh Hefner's bedroom. She was purportedly drunk from too much vodka. "There was zero intimacy involved," the former playmate reportedly revealed. "No kissing, nothing. It was so brief that I can't even recall what it felt like beyond having a heavy body on top of mine."

Aside from what went on inside Hugh Hefner's bedroom, Cosmopolitan reported that Holly Madison also dished about the publisher's policies in the Playboy Mansion, including Hugh reportedly making his 9-year-old and 10-year-old son share a bedroom with a girlfriend, imposing a 9PM curfew for his girlfriends, and making it clear to playmates that he prefers over-the-top, trashy outfits.

The Playboy founder released a statement about his ex-girlfriend's revelations about him.

"Over the course of my life I've had more than my fair share of romantic relationships with wonderful women," Hugh Hefner told Us Magazine. "Many moved on to live happy, healthy, and productive lives, and I'm pleased to say remain dear friends today. Sadly, there are a few who have chosen to rewrite history in an attempt to stay in the spotlight. I guess, as the old saying goes: You can't win 'em all!"