Prostitution is legal in India, but a number of related activities including soliciting, kerb crawling, owning or managing a brothel, prostitution in a hotel, child prostitution, pimping and pandering are illegal. There are, however, many brothels illegally operating in Indian cities including Mumbai, Delhi, Kolkata, Pune, and Nagpur, among others. UNAIDS estimate there were 657,829 prostitutes in the country as of 2016. Other unofficial estimates have calculated India has roughly 3 million prostitutes. India is widely regarded as having one of the world's largest commercial sex industry. It has emerged as a global hub of sex tourism, attracting sex tourists from wealthy countries. The sex industry in India is a multi-billion dollar one, and one of the fastest growing. Sex workers face poor conditions and structural barriers.