Leviticus German Bible Alphabetical: a also among and bare be blood Both cut during exposed flow from has he her If is it laid lies man menstruous monthly must nakedness of off people period relations sexual shall she source the their them there thus uncovered uncovers who with woman. Why were women unclean during their period in the Old Testament? Also, why were the number of unclean days different for the birth of a male child vs. a female child? Jun 21, · Oh yea and another thing, I heard that somewhere in the Bible that it is like one of the biggest sins if you have sex while on your period? Is that true? I consider myself religious so I wouldnt wanna be sinning, you know?