Mark1,
This is how I see it. If you are on a first date, and you kiss her lightly on the lips, and she freaks out, then you know she is not the one for you. Surely you don't want to date someone who is so fragile, do you? You don't have to play tongue hockey, but a kiss on the lips means it's a date.
I have a long time interest in psychology, specializing in relationship dynamics for 30 years.
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