The busty 39 year old, who bared all again for the recent July/August issue of the men's magazine, has confessed to the sexy encounter in her memoirs Bad Habits: Confessions of a Recovering Catholic.
McCarthy reveals she and her pals were on a promotional tour in Hawaii when the fun went down after one of the girls offered up a stash of hallucinogenics.
In an excerpt obtained by blogger Perez Hilton, she writes, ""Holding up drugs in front of a group of Playmates was like holding up an arm to a cannibal tribe.We jumped on the box fighting to get as many little white capsules as possible.
""Instead of saving some for later, we all pounded at least five at once. It was incredibly intense. So much so that we all began to express love for one another by making out with each other.
""I can only imagine the shock (one random man) had in seeing that he was the only man on the beach with fourteen really f**ked up Playmates who just happened to also be making out with each other.""