Leviticus 18:19

Also thou shall not approach unto a woman ,.... Not even a man to his own wife, and much less to another woman:

to uncover her nakedness, as long as she is put apart for her uncleanness ; in her monthly courses; and the time of her separation from her husband on that account was seven days, Leviticus 15:19 ; if a man lay with a woman when in such circumstances, they were both to be cut off from their people, Leviticus 20:18 ; and such an action is reckoned among sins, and uncleanness of the worst sort, Ezekiel 22:10 .