Further, "All our justices" are become "as the rag of a menstruous woman" (Isaiah 64:6) where Jerome observes: "Men ought then to keep away from their wives because thus is a deformed blind lame leprous offspring conceived: so that those parents who are not ashamed to come together in sexual intercourse have their sin made obvious to all": and thus the same conclusion follows...
I answer that, It was forbidden in the Law to approach to a menstruous woman, for two reasons both on account of her uncleanness, and on account of the harm that frequently resulted to the offspring from such intercourse."
I believe that for many women, intercourse during "that time of the month" is uncomfortable and can be painful, which I think in addition to "uncleanness" is probably the main reason for the restriction.
If you ever feel like Captain Picard yelling about how many lights there are, it is probably time to leave the thread.