Police are investigating allegations by a 30-year-old woman that she was abandoned by her in-laws for resisting their attempts to force her into the sex trade. The woman, a mother of 3 boys alleges her in-laws were unhappy that she had produced no daughters who could eventually work in the sex trade. She said it was the norm in her in-law's family for the women to work as sex workers. She said her husband worked in Mumbai and she was not sure what he did for a living, but she found out that her mother-in-law was a sex worker and her sister-in-law is still in the profession, as are three other girls of the family who are based in Mumbai. Police said they visited the house of the woman's in-laws after receiving her complaint, but found no one there. Kolkata is home to one of Asia's largest red-light districts, Sonagachi. More than 10,000 prostitutes, many from northern and central India live and work in the crowded and congested neighbourhood in the city centre.