Scarlett Johansson has made a steamy confession that will have fiance Ryan Reynolds’ libido revving - she fantasises about having sex in a car.

The actress, who announced her engagement to Reynolds in May, has admitted to a rather racy dream.

She revealed: “Sex in a car. If I were in a really raunchy frame of mind wanting something crazy and kinky, the back seat would be it.”

The bosses of a DVD porn company are claiming victory in their battle over the authenticity of a Jimi Hendrix sex romp, claiming the rock legend’s estate has failed to prove the star of the raunchy footage isn’t the late guitar great.

Vivid Entertainment released Jimi Hendrix: The Sex Tape on DVD in May and company bosses were immediately challenged over the authenticity of the footage.

Scarlett Johansson is convinced her relationship with fiance Ryan Reynolds will last, because they are among the few humans who can be monogamous.

The actress claims remaining faithful to one partner is “hard work” and not natural.

She told the latest issue of Cosmopolitan magazine: “I don’t think it’s a natural instinct for human beings. Monogamy can be hard work for some people. I don’t think it applies to everybody, and I don’t think a lot of people can do it.”