Oscar winning, past lives enthusiast and WARREN BEATTY's sister, the unflappable SHIRLEY MACLAINE reveals her sex secrets in a stunning no-holds-barred confession.

Appearing on the Oprah Winfrey Show, Mac who turns 77 this month, still managed to drop jaws with her saucy innuendo and political bombshells.  

"I wasn't into sexcapades," she divulged. "Although I tried it once. I had three people in one day.

"It was on a political campaign, where everybody was doing the same thing," she told the studio aud  with a laugh. "I just didn't want to be left out."

During the 1960s, Shirley had famously been a member of Frank Sinatra's rat pack who were not only stanch supporters but wild party pals of The Kennedys – both JFK and Bobby.

"How did you arrange that? Like one for breakfast, one for later in the day? What?" a befuddled Oprah asked.

"Something like that," Shirley added.

"But that wasn't your style?" Oprah asked.

"Not my style at all. I was a serial monogamist. And had, as I said, many love affairs," MacLaine revealed.

She denied being involved with her The Aparment and Irma La Douce costar Jack Lemmon.

Bristling at the mention of Terms of Endearment costar Jack Nicholson,"Too much for me! No, he's too much!" Shirley admitted.

"I guess I liked the dangerous chemistry if it was controllable. His isn't!

"He is authentically dangerous."