Interesting read  
 Leviticus 15:19-28 (KJV)  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.