How should a man who has sex with a menstruating woman be punished?

How should a man who has sex with a menstruating woman be punished?
He shall be unclean for seven days.	He and the woman shall be cut off from among their people.
Leviticus 15:24 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.	Leviticus 20:18 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.