Hollywood siren Scarlett Johansson has revealed that her favourite fantasy is to have sex on the back seat of a car.

The Lost In Translation star, reportedly dreams of stripping off in a vehicle and claims that having sex in a car is sexy.

"I do think having sex in a car is sexy," the Sun quoted the 20 year-old actress as telling the US issue of Playboy.

"If I were in a really raunchy frame of mind and thinking of doing something crazy and kinky and sexy, the back seat would be it," she added.

Puerto Rican star Benicio Del Toro has reportedly responded to reports alleging him of getting raunchy with actress Scarlett Johansson in a hotel elevator, insisting that there was not enough time for getting naked in the lift of the eight-storey Chateau Marmount Hotel.

"The Chateau Marmont only has eight floors. I would still be struggling out of my leather jacket by the second floor and wouldn't even have my shirt off at the seventh," the Femalefirst quoted him as saying.

According to last year tabloids, the couple was found 'all over each other' in the lift on the prestigious Los Angeles hotel after the Academy Awards.

Denying the reports, the actor later joked on the alleged lusty tryst and said, "We were making out or having sex or something, which I think is very unsanitary."