I heard the guys aren't allowed to touch themselves because its wasted seed but what about girls. Would that be okay?
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Rav Nissim Karelitz, based on the Ramban and Ritva in Niddah 13a, holds Chut Shani on Even HaEzer siman 21that there is an issur for a woman to entertain or cause sexual thoughts. The issur is "de'megarei yetzer hara be'nafsheyhu" and not "ve'nishmartah mikol davar rah".
The reason why ve'nishmartah does not apply is because there is no issur of wasting seed for a woman. That being said, practically there would be prohibited (in many circumstances) since it causes forbidden thoughts.
Rav moshe says (even Ezer Chelek 1 siman 69) that while it's a violation of BOTH lo tasuru AND vinishmarta mikol davar ra (since it leads to shichvat zera levatala) for a man, for a woman would STILL be in violation of lo tasuru EVEN THOUGH there is no concern for zera.
So Rav Moshe clearly rules that it's ossur.