United Kingdom, Sept. 5 -- Charlie Sheen has opened up about his sexual encounters with men for the first time.

The 60-year-old actor revealed he first started sleeping with men in the midst of his drug addiction and said: "some of it was weird. A lot of it was f****** fun".

Speaking on Good Morning America, he explained: "That's what started it. That's where it was born, or sparked. And in whatever chunks of time that I was off the pipe, trying to navigate that, trying to come to terms with it - 'Where did that come from?... Why did that happen? - and then just finally being like, 'So what?' So what? Some of it was weird. A lot of it was f****** fun, and life goes on."

However, he admitted he was extorted by people who knew his secret...