What the Bible says about Menstruation

And if a woman have an issue, and her issue in her flesh be blood, she shall be put apart seven days: and whosoever toucheth her shall be unclean until the even. And every thing that she lieth upon in her separation shall be unclean: every thing also that she sitteth upon shall be unclean. And whosoever toucheth her bed shall wash his clothes, and bathe himself in water, and be unclean until the even. And whosoever toucheth any thing that she sat upon shall wash his clothes, and bathe himself in water, and be unclean until the even. And if it be on her bed, or on any thing whereon she sitteth, when he toucheth it, he shall be unclean until the even. And if any man lie with her at all, and her flowers be upon him, he shall be unclean seven days; and all the bed whereon he lieth shall be unclean. And if a woman have an issue of her blood many days out of the time of her separation, or if it run beyond the time of her separation; all the days of the issue of her uncleanness shall be as the days of her separation: she shall be unclean. Every bed whereon she lieth all the days of her issue shall be unto her as the bed of her separation: and whatsoever she sitteth upon shall be unclean, as the uncleanness of her separation. And whosoever toucheth those things shall be unclean, and shall wash his clothes, and bathe himself in water, and be unclean until the even. But if she be cleansed of her issue, then she shall number to herself seven days, and after that she shall be clean. And on the eighth day she shall take unto her two turtles, or two young pigeons, and bring them unto the priest, to the door of the tabernacle of the congregation. And the priest shall offer the one for a sin offering, and the other for a burnt offering; and the priest shall make an atonement for her before the LORD for the issue of her uncleanness. Leviticus 15:19-30 And if a man shall lie with a woman having her sickness, and shall uncover her nakedness; he hath discovered her fountain, and she hath uncovered the fountain of her blood: and both of them shall be cut off from among their people. Leviticus 20:18 But if a man be just, and do that which is lawful and right, and hath not ... come near to a menstruous woman..... Ezekiel 18:5-6

Thou shalt cast them away as a menstruous cloth. Isaiah 30:22 We are all as an unclean thing, and all our righteousnesses are as filthy rag. Isaiah 64:6 Jerusalem hath grievously sinned ... they have seen her nakedness: yea, she sigheth, and turneth backward. Her filthiness is in her skirts. Lamentations 1:8-9 Jerusalem is as a menstruous woman. Lamentations 1:17

Menstuating women are unclean and sinful. Anthing that they touch is unclean. Anyone who touches anything that they touch is unclean. Stay completely away from them. (And for God's sake, don't even think about having sex with them!)Calling someone a "menstrous woman" or a "menstrous cloth" is one of God's favorite insults.