I have a real problem with the statement that being paid for sexual activity makes it impossible to consent. That's basically saying that a woman who chooses to do something you wouldn't want to do is incapable of knowing her own mind, and that therefore you want to make her act as you would rather than as she chooses.
It's a fairly fundamental human right to choose to sell your labour/your skills for a fair price. Exchanging sexual acts for cash is selling your labour and your skills, not your body. The person who pays you has no rights over anything you do once the agreed time is up, the customer doesn't get to take the seller home in a bag after the money has changed hands, any more than the client of a builder/hairdresser/accountant gets to keep the supplier in a box after paying for the service agreed.
Some jobs are more dangerous than others, and the healthy response to this is to insist that safeguards are in place as much as possible, not to insist that the job not be done. Some jobs involve bodily contact with other human beings eg physiotherapy, medical professional, care worker. If you are a care worker looking after a patient who can't attend to his/her own toilet needs, then your job may involve touching his/her genitals and anus. Not everyone would choose to do such a job, and most people would say that if you find the idea of doing that disgusting or distressing, you should seek another job. It's worth considering, at least briefly, that care work is badly paid on the whole, and mostly done by women, and often done out of economic desperation.