Those women are not exploited.  They make a calculated choice to use sex to advance careers.
What makes you feel that women aren't being exploited?
I can't imagine a woman wanting to with someone for money without some artificial incentive.
Women can get into sex work for a number of reasons. You shouldn't make assumptions that they aren't exploited there are a lot of conversations around the issue from women  that you can research. It's also not okay to make judgements about  what women do with their bodies or their sexual practices.