In an interview with Britain's GQ magazine, the 63-year-old also admitted to using ******* at parties until she was ****** to quit in the early 1980s.
Dame Helen, who picked up an Academy Award last year for her portrayal of The Queen, said she was date-***** "a couple of times" when she was young but did not report the attacks because "you couldn't do that in those days."
Despite her experiences, the British-born actress said date-**** was a "tricky area" and something men and women had to work out between themselves.
She said it was **** if a couple engaged in sexual activity but the woman said "no" at the last second.
However, in comments likely to anger anti-**** campaigners, she added: "I don't think she can have that man into court under those circumstances. I guess it is one of the subtle parts of the men/women relationship that has to be negotiated and worked out between them."
Dame Helen also spoke of her "love" for ******* during the interview for the October edition of GQ, but claimed she gave up the **** after learning that a leading **** war criminal had been profiting from the ****.
"I loved ****. I never did a lot, just a little bit at parties," Mirren told GQ. "But what ended it for me was when they caught Klaus Barbie, the Butcher of Lyon, in the early 80s.
"He was hiding in South America and living off the proceeds of being a ******* baron. And I read that in the paper, and all the cards fell into place and I saw how my little sniff of ******* at a party had an absolute direct route to this horrible man."
