Regarding deriving pleasure from physical pain, I’m currently reading Hurts So Good - The Science & Culture of Pain on Purpose by Leigh Cowart, and I’m very much enjoying it.
And, of course, this is the song I referenced in this comic:
I’m about ready to put up one of the first stories that’s just for paid subscribers. It’s going to be a fun & pretty 6-page comic. The first four pages will be free for everyone, and the last bit will require a paid subscription. Look for it on Monday!