marry a village virgin. Then tell her that they all look like that. How will she know any better, and if she questions, you can say "You hussy!! Been looking at other guys' privates have you?!"
Only joking. Seriously, I don't think girls care about these things. If it does its job efficiently, a woman wouldn't care if it was green.
Uhm if it were green I'd be highly disturbed..as that means cough*STD*cough