Scarlett's HIV tests leave docs confused

Hollywood beauty Scarlett Johansson has got sex experts confused after boasting about her HIV tests.

The actress recently revealed in an interview that she's so "socially aware" she gets tested twice a year, prompting sex doctors to question why she feels the need for the check-ups.

"It tells me that although she is in a steady relationship (with actor Josh Hartnett), she may be having sex with other partners or she suspects her significant other may be straying,” top sex and relationship expert Dr Ava Cadell was quoted by Contactmusic, as telling US publication the Globe.

"It would be better if she practised safe sex until she and her partner are absolutely sure they will maintain a monogamous relationship," she said.

But Johansson has fired back at the remarks suggesting she's being unfaithful. "There seems to be a mistaken belief out there that I am sexually available somehow, but when I am in a relationship, I'm in a relationship," Johansson said.