14 Heb “the nakedness of a father one uncovers within you.” The ancient versions read the verb as plural (“they uncover”). If the singular is retained, it must be taken as indefinite and representative of the entire group. The idiomatic expression “uncover the nakedness” refers here to sexual intercourse (cf. Lev 18:6). To uncover a father’s nakedness could include sexual relations with one’s own mother (Lev 18:7), but more likely it refers to having intercourse with another wife of one’s father, such as a stepmother (Lev 18:8; cf. Gen 35:22; 49:4).
15 Heb “(one who is) unclean due to the impurity they humble within you.” The use of the verb “to humble” suggests that these men forced themselves upon women during menstruation. Having sexual relations with a woman during her period was forbidden by the Law (Lev 18:19; 20:18).

In other versions

In you men uncover their fathers’ nakedness; in you they violate women who are unclean in their menstrual impurity.

In you are those who dishonor their father’s bed; in you are those who violate women during their period, when they are ceremonially unclean.

Men within you have sexual intercourse with their father’s wife and violate women during their menstrual impurity.

Men sleep with their fathers’ wives and force themselves on women who are menstruating.

They uncover the nakedness of a father among you; they violate a woman unclean of menstruation among you.

In thee have they discovered their fathers’ nakedness: in thee have they humbled her that was set apart for pollution.

Public Domain