I like the list of identities you've given, and I also like the idea of including sex workers. (Also, this is a great way of talking through these issues; A+ modding there!)

To address the question of how to conceptually divide folks who are sexual minorities along different sort of axes, maybe by a series of bullet points? Is that me being too structural? Because kinky folks and LGBA folks and sex workers are all "sexual minorities" by the definition you use, in that their sexual practices are marginalized and stereotyped; but I think sorting them out along different axes (sorting by gender of partner, by practice, by number of partners, by commercialization of sexual practice).