Sex, Commodification, and Labour
It's pretty easy to define a union, but it's rather difficult to define the commodification of the female body and mind in such a way that doesn't automatically exclude every form of labour in a capitalist system. Are female bodybuilders commodifying their bodies? Are women who so scientific research for corporations, nonprofits, and governments commodifying their minds? If so, then should feminists automatically be opposed to female bodybuilding and performing scientific research? How about construction work, boxing, auto repair, or military service? The problem is that under capitalism everything we do is commodified. That's the nature of our economic system. Sex work doesn't commodify women more than any of these examples.
So you would argue that writing, as one example, is just another form of prostitution?