It's been discussed superficially, so specific references from performers are better.
What delineates LK, LFK, MFK, DFK, and PSE/GFE-level kissing? What durations count for each? What openness of lips counts for each? How intermittent/continuous counts for each? How far do tongues need to go for each? How mutual does it have to be for each?
Does mouth mileage correlate with the general mileage of the dance/VIP? eg does a HM high mileage VIP seem to only go so far on the mouth mileage while a VHM, UHM, or SHM VIP get greater mouth mileage with it too?
It sometimes gets discussed sporadically in reviews, but thought a thread would be helpful to collect thoughts and experiences.

