Aitch, what my boy children (young adults already) choose to do with their genitals, and with whom, is absolutely none of my business. And of course I don't have stats on the brothelworkers - do you, for those specific women? Given that, what is it, 25% of British women have been, or will be, sexually assaulted at some time, I'd guess at least 25% of them will also have been. (I may be wrong on the 25% thing, it's a number that popped into my head and I'm not sure where from.)
However, brothel keepers prefer workers who turn up when scheduled, so drug-addicted women, who tend to live chaotic lives, are not good brothel workers.
But the fact is, we cannot ever really know.
So why do we seem to prefer to believe that they're living in some kind of hell, when plenty of them don't seem to be?