Ill start.
Year 2000. Going into freshman year of HS. Was at a dance with another girl, she went for cheerleader pics ( no she was not good looking). Met another girl on dance floor. Saw her again later that night when everyone was out for dinner. Got her number. Met up a week later. Banged her in passenger seat of her car in a parking lot.
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When I was 14 years old with someone I'd been dating for a year. He was 3 years older then me. In the back of his car. Definitely not my proudest moment and definitely not the best sex I've had, even through the rest of the relationship, it all sucked.