Bollywood superstar Shah Rukh Khan investigated over alleged illegal gender testing of unborn child NEW DELHI Health officials in Mumbai are investigating reports that Bollywood superstar Shah Rukh Khan and his wife know the sex of a baby they are having through a surrogate mother. Sex determination tests are banned in India to stop the practice of aborting female fetuses due to a preference for sons. Khan was not at home when municipal authorities tried to question him about reports that the woman had such a test, Press Trust of India reported. Shah Rukh Khan cancels trip to U.S. A complaint filed by an unidentified, non-governmental organization alleged that Khan and his wife know they are expecting a boy. Khan has refused to comment. The hospital where the surrogate mother is receiving prenatal care denied conducting any sex determination tests, according to the Times of India. The 47-year-old actor, popularly known as "King Khan" in the Indian film industry, has acted in around 75 Hindi feature films, including many box-office hits. He has also hosted a season of the Hindi version of the game show, "Who Wants To Be a Millionaire?" Shah Rukh Khan detained at U.S. airport He and his childhood sweetheart Gauri have a son and a daughter. India's 2011 census showed that the country had 914 girls for every 1,000 boys under age 6, a gender ratio mainly attributed to sex-selective abortions despite the ban on prenatal gender tests.