LOL, you are aware of the book 'Men are from Mars and Women are from Venus' arent you? IMHO neither men o nor women truly understand the other sex, we like to think we do, but dont.
Learning about someone's likes, dislikes, little ways, etc is not imho 'learning their language'. But hey each...
Nope, never did, that moment when you meet was rarely wrong IME. Will never know on the others of course
Do you ever finish a date early if its not going how you want