Well, it's an ordinance. Dealing particularly with being unclean.
Prophesied here: Zechariah 13:1
In that day there shall be a fountain opened to the house of David and to the inhabitants of Jerusalem for sin and for uncleanness.
Explained here:
Ephesians 2
13 But now in Christ Jesus ye who sometimes were far off are made nigh by the blood of Christ.
14 For he is our peace, who hath made both one, and hath broken down the middle wall of partition between us;
15 Having abolished in his flesh the enmity, even the law of commandments contained in ordinances; for to make in himself of twain one new man, so making peace;
I suppose it is no more of a stretch to "fulfill" a feminine condition than to make a proscription against it in the first place :^)
Where's the headache guy? Thread hijacked agin!