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The December Challenge is completed by abstaining from masturbation for the entire month of December, besides Christmas.

You have to masturbate on Christmas.
Johnny: Hi mom.

Mom: Hi Johnny.

Johnny: Did you know that it's gonna be a white Christmas this year?

Mom: How do you know that Johnny?

Johnny: I'm partaking in the December Challenge.

Mom: Oh.
by K_Money December 21, 2013
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