I'd say most men when they watch porn they have a set of positions they enjoy (varies a lot between people)... some even like it in a particular order and be done.
A feature for you guys to consider would be to create your own "personalised experience" where the customer can configure all the positions he like with a duration set that they prefer... just once.
- Blow job (4 min)
- Missionairy (3 min)
- Blow job (1 min)
- Doggystyle (2 min)
- ...
The moment you click a video and choose "personalised experience".. it will play the video based on your preferences and order in a Tiktok-y fashion. Even more amazing is if you could populate an extra feed with all the videos that match your preferences that contains all the positions with the durations to "create" that personalised video on the fly.
Just an idea but in general I wouldn't engage this idea too much. The reason why watchtime is 7 minutes over an hour video is the fact that the positions men enjoy varies a lot. I might love "prone bone" but another guy might hate it and skip instant. One person loves the talking and another person thinks its filler BS and goes straight to action.
Don't blindly stare at data but contextualize it to your business use case and target audience.