KIEFER SUTHERLAND - SUTHERLAND'S TALKS ABOUT DRUG EXPERIENCES

KIEFER SUTHERLAND swore off drugs for life, after an experiment with marijuana left him a flop in the bedroom.

The 37-year-old star of TV hit 24, was just 18 when he made the mistake of smoking the potent weed before a sexual episode with his then girlfriend

. Sutherland explains, "I got really stoned and my mind started drifting off somewhere else - thinking about what I had to do the next day, when I had to be at work, wondering what my parents were doing, where my sister was.

"I thought about everything except sex.

"I was moving very quickly, and I thought, Oh my God, I'm going to kill this person: I'd better finish. And I did."

But when Sutherland looked at the television, he realised, "All of this had taken place in the span of a two-minute commercial."