My advice is to, basically, talk to a girl more or less the same way you would talk to a new guy you just met. Say hello I'm so and so, how do you know this guy, whacha do for a living, whatever you would say normally to a man you just met, say it to a woman too. Cause when you're a girl at a party, you get tired of every guy either trying to pick you up or stammering and sweating cause they're worried about if you like them or not. Normal conversation is all too rare.
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Everything would be better if you were in charge.