How exactly do you define the “bases” of dating as in “Making it to 1st base, 2nd base, or third 3rd base?“ ?

How exactly do you define the “bases” of dating as in “Making it to 1st base, 2nd base, or third 3rd base?“ ?
How exactly do you define the “bases” of dating as in “Making it to 1st base, 2nd base, or third 3rd base?“ ?
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