In order to get food on the table people will agree to many kinds of dangerous, dirty, and unwanted lines of work. People have entered the death sentence called a coal mine, gone into work which has a life expectancy of months, but in contrast to prostitution those are often viewed as sacrifices rather than something shameful. I suspect this has something to do with gender roles, where a man who is forced by poverty to unwanted work is a hero while a woman doing the same is a victim.