There has been a lot of research into the backgrounds of women who work in the sex industry. As a result of that, some researchers have placed the figure of women who have been trafficked/coerced/addicted/forced through desperation as high as 75%. Others place it less high but still as a significant proportion.
You have to allow for the fact that to some extent the population involved in the research will be self-selecting, which may appear to inflate the figures of course, but that will be tempered to some degree by the number of women who are adamant they are doing so willingly and quite evangelical about that but it could be argued they are suffering a horrific degree of cognitive dissonance (e.g. were systematically abused as children or have an abusive partner who is 'supportive' of what they do).
I think it is a statistical probability that there are women in these industries who enjoy what they do and are doing it under no pressure whatsoever. (Personally I would argue that while this career may be a good move for them as individuals, it is damaging to women as a gender group because it perpetuates the objectification of women, but that's another issue). However, I think for every woman doing it from this background there are probably an awful lot more who are doing it for the wrong reasons. As a punter I would have no way of knowing which was which, and I wouldn't trust the management (who are, after all, simply a profit-making organisation operating under capitalist rules) to make the distinction with the necessary due care and attention. I could not find it remotely entertaining or arousing to watch someone strip knowing that they may well be there under duress - no matter how big the smile on their face.
Sex sells and our culture normalises that, particularly these days with the easy access to free online porn. I think a lot of men end up in strip clubs without a moment's thought about what goes on behind the scenes and I can allow for youthful naivety and ignorance. However, once you've had an intelligent discussion on the issue, IMO you can't frequent these places without it saying something about your attitude to women and exploitation.