Should sub girls having their period (and not having pain or such) be sexually used as normally all month?
Menstruation is a natural, normal physical process. Menstruating sub girls should be used according to their preferences and those of their partners.
As for a girl of mine?
The fact that her slowly withering ovaries have managed to shit out yet another fallopian folly this month —and in the process left me taking a piss next to a trash can that looks like all of World War I happened inside it— isn’t a girl’s fault. She was born disgusting, and while she must bear the burden of Eve’s sin, she should not be blamed for the curse; thus during her period, I seek to be ruthlessly patient, accept her apologies for her wretched effluvium, and tell her to be careful if she wants to keep those teeth.
So, yeah. I treat them normally.