I would echo all of what has been said on here. This has got to be a scam.
So you get to India, you get gang raped, or god knows what else, who do you complain to? they could do what ever they like to you and you would have no comeback whatsoever. I am guessing they are offering you a very large sum of money to do this, and this is why you are tempted. Do not go under any circumstances.
When you say you have checked them out, do you know girls personally who work for them, and have done for a long time, who have also done this type of booking? I say this as there are some very clever scams out there, in the case of one girl I met, drugged and raped in another country, and left with no money, luckily it was an EU country and she got back home, shaken but learned one hell of a lesson.