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When two high school senior girls make a pact that if they are still single at their 10-year high school reunion, they will have sex together. Typically the girls are very good friends or best friends and are not lesbians, and have never fooled around together previously in their friendship.
Girl 1: "Ok, lets make a 10-Year Sex Pact: if we're still single in 10 years, we'll have sex after our 10-year high school reunion."

Girl 2: "Alright."
by Tex-Mex Shawn C. September 20, 2010
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