Parallel
Leviticus 20:18
Brenton's English Septuagint · Berean Standard Bible
And whatever man shall lie with a woman that is set apart [for a flux], and shall uncover her nakedness, he has uncovered her fountain, and she has uncovered the flux of her blood: they shall both be destroyed from among their generation.
If a man lies with a menstruating woman and has sexual relations with her, he has exposed the source of her flow, and she has uncovered the source of her blood. Both of them must be cut off from among their people.