19 " 'Do not approach a woman to have sexual relations during the uncleanness of her monthly period.
19 Also thou shalt not approach unto a woman to uncover her nakedness, as long as she is put apart for her uncleanness.
19 "You shall not approach a woman to uncover her nakedness while she is in her menstrual uncleanness.
19 "Don't have sex with a woman during the time of her menstrual period when she is unclean.
19 'Also you shall not approach a woman to uncover her nakedness as long as she is in her customary impurity.
19 "Do not have sexual relations with a woman during her period of menstrual impurity.
Matthew Henry's Commentary on Leviticus 18:19
Unlawful marriages and fleshly lusts.
Here is a law against all conformity to the corrupt usages of the heathen. Also laws against incest, against brutal lusts, and barbarous idolatries; and the enforcement of these laws from the ruin of the Canaanites. God here gives moral precepts. Close and constant adherence to God's ordinances is the most effectual preservative from gross sin. The grace of God only will secure us; that grace is to be expected only in the use of the means of grace. Nor does He ever leave any to their hearts' lusts, till they have left him and his services.