I know this is a bit off your intended topic, but your post got me to thinking. The only pornography I ever watch is spanking related. I'm not even interested in vanilla pornography because I find it mechanical, dreary, and not very erotic. Unless there is spanking involved, it just isn't arousing. Same for having sex with my wife. Back when we were young and perpetually horny, we could have vanilla sex, but now, it's impossible to enjoy sex without incorporating spanking into the mix.
We do funishment sessions for breaking the "rules", but I'm thinking it would be a bit odd if either of us had a problem with the other watching spanking porn (and alas just about all spanking videos are porn). We used to watch spanking porn together, but we stopped some time ago (not sure why, outgrew it I guess). Not sure if she still does, but I do. Yet, a lot of the time, I watch spanking porn not to get off but just to get ideas and see new implements and techniques in action.
In fact, over the last year or so, I have become obsessed with the use of leather straps (I have a dandy leather strap from London Tanners that was gifted to me from a friend on SN). I have a Canadian prison strap on order (yes, extreme, but I'm always willing to try anything at least once). I have watched every spanking video I could find where a leather strap was utilized both M/f and F/m. This helped me a lot with the proper application of the leather strap to my wife's shapely bottom. She, on the other hand, is still trying to get the hang of it on me (we're switches) but nevertheless, it stings like holey moly and it's always a rip roaring good time.
Anyways, it makes me wonder how many spankos are watching spanking videos for straight instructional purposes. Nobody should be punished for that, right? 😉