Eh. Your points are valid bout the visual aspect. But still miss the appeal which no isn't about man belly. I realize youll mostly be getting that in the shot but didn't much expect that being on the receiving end of a face fuck is all that scenic.

I've seen these glasses in other applications and it seems to work very well for a good POV perspective.

Sure it would mostly be a back and forth jerking towards a wall of skin. But would also be accompanied by some spectacular audio given the glasses being firmly secured to her skull.