Was accidently messaged by a girl on AIM, started talking, exchanged pictures... 3 years later I met her and hit it that night. Never spoke to her again.
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Myspace... A girl added me as a friend later that day I hit it. Hit it 2 more times and then she told me she liked my friend. I told the little smut to get lost.
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Various other stories like that... I'm taking a break from sex.