Scarlett's No Harlot

Scarlett JohanssonWe're not quite sure who started the rumours...

But apparently people are under the impression that Scarlett Johannson is a bit of a minx.

And she wants to put the record straight.

The Black Dahlia actress, who is currently dating her co-star Josh Hartnett, insists she is a taken woman, although she does admit to, erm, enjoying herself when she has been young, free and single.

She told US magazine Allure: "Contrary to popular belief, I'm not promiscuous.

"There does seem to be a mistaken belief out there that I am sexually available somehow - which is not to say that I'm not open-minded about sex... yet I wouldn't say I'm a serial monogamist, either.

Josh Hartnett"I mean, I went through periods of time when I was, ah, single. But when I'm in a relationship, I'm in a relationship."

Having said that, Scarlett believes monogamy may not be a natural thing for human beings.

She said: "I do think on some basic level we are animals, and by instinct we kind of breed accordingly.

"But as much as I believe that, I work really hard when I'm in a relationship to make it work in a monogamous way."

The actress went on to say that she gets HIV tested twice a year and screened for sexually transmitted diseases, adding that it's "irresponsible" for people not to.