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When I was in high school, my mother had a habit of turning my casual friend hangouts into after-school specials. "Don't sleep around," she'd tell me and whatever poor, poor soul I'd brought over. (Other talks on heavy rotation included the typical "Don't do drugs" and "Don't leave your drink unattended" spiels). "Wait until you're in a serious relationship," she'd say breezily, "and then make sure the guy you're with gets tested." Sound advice, sure, but