Barber shops with females generally sat around in a non descript way are your best option. Go in for a shave, cut, head massage, whatever and the conversation with the bloke will detour towards facials, grooming and then body massage.
That's where the girl or girls hanging around the shop will come into it.
Agree a price and you'll be taken to a private room where you can discuss extras with the girl.
In my experience it was okay, cramped surroundings but very cheap!
Old Delhi around the train station is the most likely place you'll get the extras and the best prices.
