My god there is some nonsense on this subject.
You ask if she is clearly way hotter than you, you are unsure, on limited time and it is part of some banter.
Otherwise you roll the dice when the moment (or alcohol level) feel right.
Looking for a list of clues is very beta and shows you have zero confidence, or experience and thus have limited sexual value to normal women.
The rules are if they want to fuck you then its all good, if not then they will reject you. If they reject you then move on and don't be creepy or needlessly persistent.
There are no other rules, hints, signals or secret Davincci Codes.
Go and kiss / fuck some munters and work your way up once you know what you are doing.
A fedora and a blueprint of the perfect woman / romance will lead you to a life of jacking off into a sink.