War of the Sexes by Kissmyoops3 (I haven't really read the sequel.... yet :P)
Description:
When Ellie and her friends pull a prank that goes horribly wrong, Ellie finds herself in a position to which no one had imagined. She had been frozen in time for nearly 500 years, finally thawed it in a world of split sexes. Desperate for any way back to her old world, she meets two boys who agree to take her to the "Nerd" as he's known on the Boy's World. Hatred and chemistry start to tango as the journey begins to see if Ellie can ever return home.
Completed
