It occurs to me that it might be useful to add a tag for "history of sexualty textbook" now that I've included a handful of items in that genre. I have doubts about how useful they are to my imagined target audience, though it's hard to tell without feedback. All I know is that, in general, I've found them of minor use and interest to me personally. This means I'll try to deprioritize them in my reading--the problem being that it isn't always possible to identify something as being a textbook until I start reading.