The SIT insisted it needed to see more girls and wanted their pictures as well. Rahul then asked the team to travel with him to Kolkata.

At the New Delhi Railway station, Rahul introduced the undercover team to one Priyanca and a child he claimed was his son.

Rahul even allowed the team to shoot him on a handycam and just before reaching Kolkata, demanded an advance.

Rahul: Main bolta hu Rs 5,000 abhi de ke rakh. Baad ka jo kharcha hoga dekh lenge. (Give me Rs 5,000 right away. We’ll deal with the other expenses later.)

CNN-IBN: Zyada se zyada Rs 3,000 hai. Samjha kar. (I have just Rs 3,000 right now)

Near Kolkata's Sealdah Railway Station, Priyanca said she could help the team film some underage girls.

"Mera baat suno. Dono kaam ek sath karna hai, thik hai? Tum log jaoge, dekhoge, mai razi kar saku usko, thik hai na? Jo paisa bol rahe ho dedunga tumhare samne, lenge toh thik hai aur nahi to mera koi galti nahi hai. Mere baas mai jitna hoga mai karungi aap log ke liye. (Listen to me, both of you work together okay? Whatever money you are speaking of, just offer that. You can film them. I’ll try my best to help you both.)" she said.

Rahul took the team to Sonagachi, India's biggest red-light area, home to over 10,000 sex workers. The group entered a house and were greeted by a man who said he was the owner. The team switched on the handycam and a brutal parade began.

The girls were made to introduce themselves, forced smiles in place. Some of them looked about 16 but many were not even 12 years old.

Most of the underage girls the team met in Kolkata were trafficked from Bihar, Jharkhand and Nepal and were then put on trains to Delhi and forced into flesh trade.

During the investigation, the SIT found there was a huge demand for underage girls in metros like Delhi. According to figures released by Government of India, 53 per cent of India's children are sexually abused at least once. A UN report too claims it's child prostitution is $32-bn industry.

CEO of NGO Naz Foundation, Anjali Gopalan explains the disturbing trend. "Minor girls are being increasingly pushed into the flesh market because many men think they will be safe from being infected with HIV and other sexually transmitted diseases," she says.

That’s not all. With girl children fetching up to Rs 1 lakh, traffickers like Rahul and Mukesh admitted family members were often prepared to push their girls into the flesh trade.

Clearly, it’s the money that drives the perverse virgin prostitute racket, pushing thousands of minor girls into sexual slavery.

(With Ritwik Deo and Manmohan Gupta)