You learn a new thing every day. ;)
If you want to go strick bible intrepretation, it just says men shouldn't masterbate because they shouldn't spill their seed. Girls have no seed so can have fun all they want and it's not a sin. ;)
Referance.
Referance.

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...Wait. I'm not religious. WHOO! Time to piss some deity off.
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Or I could be having some really bad memory loss on this matter.
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Buy yay for female masturbation! :D
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