Interesting but not that far out there... I don’t really see it like that though a female can corrupt another female just as well as a man could. (She just cannot become pregnant and it doesn’t say mother’s need not apply.)
Of course I would probably give nymphs an free ride when it comes to a unicorn even after having a male partner cause well they never see their actions as wrong and hence never lose their innocents.
Now if one becomes married, which implies only one partner, then I would say that they lose their innocents.
Edit: Of course my opinion doesn't really matter... I'm just tossing another idea out.