Jay Leno made Scarlett Johansson an unusual offer on his show last week – The chance to live out her sexual fantasy of getting down and dirty in a car.

The chat show host made Scarlett recount what she told women’s magazine Cosmopolitan when she appeared on the cover.

The Vicky Christina Barcelona actress explained: "Somebody asked me one time what my sexual fantasy would be and under the guise of sounding crazy I said it would be having sex in a car. But that seemed kind of conservative to me afterwards."

And Leno - who boasts a massive collection of antique cars - took to the admission by offering one of his vehicles for Johansson's sexual escapades.

But the stunned actress was quick to reject the offer, shouting back at the host: "Jesus Christ... what is going on?"

Leno had better watch his back, Ryan Reynolds may soon be after him...