I read the article and my main contention is that it doesn't establish why we must treat the performance of sex as morally different to any other form of service work. As I said in the other comment I believe that the way we are compelled to treat sex as "different" is a manifestation of patriarchal thinking - there is nothing fundamentally different between a woman who is coerced by poverty into prostitution and a man who is coerced by poverty into agricultural work, and the ways to solve the exploitation in both cases is the same: organization of the workers against the bosses, the abolition of bosses altogether and shifting control of that industry to the workers in it, and ultimately the abolition of the capitalist mode of production that incentivizes maximum exploitation of all who participate in it.