When I was s teenager my older brother for some reason had sex guidebooks in his stash, I would peruse through them when he was not at home, they were drawings and art rather than real people, but they showed everything, including sex positions. I wanked to them furiously.

Anyone else done that?

Oh yes. I was given a facts of life book by my parents aged about 12. No pics, but is still wanked to the descriptions, especially the bit about masturbation. Even then it was wanking which excited me - I'd never been near a woman. As an adult I found a great instruction book in a library which included a bit about how "understandably most men have never seen another erect penis" (this was pre internet) so here are some drawings of different shaped stiffies. Then sex positions. Just drawings, but I sneaked into the gents and pulled myself off.

Yea had a video in my teens of one of these and was the first time I saw real blowjobs and fucking etc

Was such a fucking turn on and the slut in the video was plain but hot would love to thank her for all the teen spunk she made me drain

Very arousing materials for sure. Sometimes the clinical, detailed, mechanical how to videos really are hot. Almost like they are watching and guiding you. I have masturbated and ejaculated to them countless times.

Reminds me of the "Joy of Sex" book.

Are you sure that's not just porn? Lol.