During a loooong drive back after a date I mentally went through every date with every girl and created statistics like how many dates each one lasted and who ended it…
One thing I found interesting was that the three girls that I had dated the longest each asked what my birthday was on the first date (and then let me know when theirs is, I never asked). I thought afterwards that discussing each other’s birthdays on a first date creates an artificial kesher and should probably not be done.