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Mothers who manage to come up with good pick-up advice for sons might wind up with more grandkids on average. To the extent that accurate pick-up advice (or the ability to think of accurate pick-up advice) passes from one generation to the next, I'd expect parents to have otherwise-mysteriously accurate pick-up advice.
Not my mother. I tried to talk to her about my dating problems in my early 20's, and Mom came up with, "Ask out the fat and ugly girls. They don't have boyfriends."
Needless to say, this "advice" astonished me, and in a bad way. You don't normally expect your mother to express open contempt towards you.