Most videos now have programmed bookmarks for each position performed in each scene. I would think a fairly simple but super effective way to 1. For the subscriber to be able to quickly get a sense of what the best parts of these sometimes fairly long 1+ hr videos are and 2. Help the SLR production team really start to get a large sample size of VOC (voice of the consumer) on best positions/angles/lighting etc are.
That data when analyzed can give excellent feedback and help drive continuous improvement production on how to maximize each and every video for highest level immersion and captivation of audience.
The easiest way I think would be maybe a long press of each tag within the in-video UI which would allow you to vote/favorite on that particular sex position segment within the scene.
You could keep it a very simple vote with a favorite (heart icon) or you can give it a 1 to 5 rating that shows up after the long press. It really all depends on the level of feedback you want to give/receive.
If that position is favorited by a user it could have a heart icon next to it for future reference for that particular subscriber as well (this would be a great help for many of us that want to keep tabs on our personal favorite parts of these longer videos). Each bookmark/ tag could then either be color coded (blue=cold to red=hot) or have a smaller person icon next to it with the number of favorites that sex position tag received from the general populace.