I spent time in India in 2011 and 2013, and tried to put things in place for a punt in Delhi. I found that a number of agencies are run by men, and were asking for rates you'd pay in London, like $250US - in a third world country???.
Plus TBH you dont have any idea if the WG's pics are really of a Bollywood Babe or the genuine thing as there is so much fakery and scams in India. For example, are they going bait & switch chosen girl for a back street skank who would do the deed for 40 rupees (42p). It is estimated India has 76MILLION homeless, many sleep under plastic sheets under road flyovers. The poverty is terrible, so some try to earn whatever they can.
In Delhi, my hotel was near Connaught Circus, a busy vibrant area, and close to New Delhi station and GB Road, where most of the cheap hookers can be found, but it's a hovel, a ratrun of rooms and corridors, and not for the unwary. There are also a lot of under age girls down GB road. Whether the Maitre D at the hotel can help is another matter of course, but all the Delhi hotels I stayed in had airport-style baggage scanners and metal dectors to ward off terriorist attacks. That may put a lone female off too. I wont go down the caste route either.
In the end, I decided not to pursue a WG, as (a) it was simply too much trouble and (b) another major concern was the high level of diseases - HIV, STIs, TB, scabies and so on.
Anyway, my views based on a total of four trips and 6 weeks in the country, and remember, everything in India is negotiable.