'The Hangover Part III' actress insists she doesn't turn to alcohol or drugs to have a good time and instead relies on the intimate, amusing conversations she has with her girlfriends.
She said: "Well, we're still wild, we talk about how to get the best possible sex, how we want to meet somebody and have a great career.
"We're not that tame. I just don't really drink or do drugs."
The blonde beauty is so close to her female pals she has even written a film script based on their friendship, similar to the male character's Wolf Pack in the comedy film, but more "raunchy".
She said: "I do have girlfriends who I love, actually, that I just wrote a script about. I have these friends, we get together and we make wishes.
"It is definitely not as dark as 'The Hangover', it's more like, 'What positive things do we want to have happen?' It's kind of raunchy.
"I've given the script to a bunch of people to read, and one guy was really horrified. He was like: 'Do women really talk like this?'
"Some men are really scared. I think women are really honest about sex."
Heather - whose ex-boyfriends include rocker Adam Ant and the late actor Heath Ledger - is still open to meeting someone new and knows what kind of man she wants.
When asked what she looks for in a guy, she told Look magazine: "Just a sweet, loving person. Funny, smart, you know? That you have a great connection and chemistry with."