Although I have listed pornography elsewhere, I felt that some links about what people do rather than what they watch people do would be interesting. What they do sexually, I mean.
The crossover is of course interesting too. Seth Stephens-Davidowitz’s amusing book on search-versus-survey polls makes some provocative deductions ab how closeted everyone is. Disclaimer: I haven't read the book, and while I can see looking at google search data could do away with certain survey biases, there are obviously many other biases in the data, and I have no idea how/if he dealt with those.
Paul Collins, Spanking the Monkey on the weird moment that was Edward Bliss Foote’s gory, mail-order, anti-racism, pro-phrenology, snake-oily, home-health-and-sex edutainment empire of the late 1800s. Some of the books they discuss are scanned and online for your reading and remixing.