Here is my end word: Would you want your wife, daughter, mother involved in prostitution? If not why not? After all it is consenting and makes money? Or is there more than just that at stake?
The end word for me would be how she felt about it. I personally see sex as a normal body function, like defecation or sneezing, except it is more fun. But we have the weight of all the moralising and religiosity and prudishness and displaced frustration that has grown up around it for the past few thousand years. All this baggage has distorted a perfectly natural thing that we are all born with.
I love my cats, I really do. I have a very strong bond with them. But I don't have sex them. I believe sex and love are different things that have got tangled up together to the detriment of both. Human beings are physical creatures. If you love someone having sex with them is a natural expression of that. But it is not something so intrinsically special that it can only be indulged in after you have 'fallen in love' and gone through a bunch of rituals. Anyone can sneeze. Anyone can have sex. What is the big deal? Are there not people who truly love each other but never have sex? If so, can there not be people who always have sex but don't love each other at all? Or who also have sex with people they don't love?
If I was very close to someone, such as a daughter, and she genuinely wanted to be a prostitute for whatever reason, and she was happy with it and not damaged by the inevitable social opprobrium, then I do not think I would have a problem with it. I think anyone who would have a problem just has a problem with sex.
I also have enormous respect for the work you have done in India. That takes real courage and commitment. It cannot be applauded loudly enough. I couldn't do it and that makes you a better person than I am. But I still believe the women you worked with were victims because of the unfair social and economic circumstances imposed upon them, and the evil people who exploited and profited from them. I do not accept that they were victims because they were selling sex. I just don't make that connection.