I personally feel that for a woman to actually partake in being an escort, doing pornography, stripping, etc. shows that she has a lack of respect for herself. Normal and well adjusted women do not engage in behavior like this, as they realize it is degrading to them. I actually had a conversation about this with a few people not that long ago and most agreed that women that do this aren't usually all there. I think a big part of it is that they see how quick they can make cash doing stuff like this and they get sucked into it.
As I mentioned earlier, most men would never consider these women as potential relationship material, though they sure as hell may want to **** them. On a side note, I've heard of guys that got off by the idea of dating a stripper or porn star, as they see all these other men desiring their girl and it gives them some sort of odd satisfaction from it.