I can't believe how unbelievably insulting this is to the vast majority of disabled people. Implying that the only way they could have sex is if someone is paid for it. Ugh!
Sex is not like selling any other skill or talent. I sell my abilities to my boss and in return I get paid. The most I suffer from my work is perhaps a bit of stiffness from sitting in a chair at my desk for too long. Even in a manual job there is legislation in place to minimise risk. Sex for prostitutes carries the risk of death, serious injury, rape, sexual disease, loss of fertility and emotional harm. It is incomparable to any other line of 'work' and no amount of legislation can counteract those risks.
STDs are not eradicated by using condoms. And how do you prove rape when 'consent' as a legal principle is established the minute the 'sex worker' takes the money? At that point she has pretty much lost any control she had to ensure her own safety as even though she might not want anal sex (for example) how is she going to prove that later? Who's going to take the word of a prostitute in court?
No one ever died or became ill from not having sex. No one suffers emotional trauma from not having sex either. Frustration yes, but then I'm frustrated that no one has seen fit to reward my hard work and intelligence with a six-figure salary either. 
I am disgusted by this. Not only on behalf of exploited women the world over, but also on behalf of the many disabled people who feel that this will set back their cause to be seen as fully functional members of society.