Leviticus 15:24

Female Bodily Discharges

²³ And if it is on her bed or on the thing on which she is sitting, when he touches it, he shall be unclean until evening. ²⁴ If a man actually lies with her so that her menstrual impurity is on him, he shall be unclean for seven days; and every bed on which he lies shall be unclean. ²⁵ ‘Now if a woman has a flow of blood for many days, not during the time of her menstruation, or if she has a discharge beyond that period, as long as the impure discharge continues she shall be as she is in the days of her [normal] menstrual impurity; she is unclean.

Sexual Relations

Leviticus 20:18

If a man lies [intimately] with a woman during her menstrual cycle and uncovers her nakedness, he has exposed her flow, and she has uncovered the flow of her blood; both of them shall be cut off from their people [excluding them from the atonement made for them].

Leviticus 18:19

‘Also you shall not approach a woman to uncover her nakedness during her menstrual impurity and ceremonial uncleanness.

Ezekiel 18:6

and does not eat [at the pagan shrines] on the mountains or raise his eyes to the idols of the house of Israel, or defile his neighbor’s wife or approach a woman during her [monthly] time of impurity—

Leviticus 15:33

and for the woman who is ill because of her monthly period, and for the one who has a discharge, whether man or woman, or for a man who lies with a woman who is [ceremonially] unclean.

Ezekiel 22:10

In you men have uncovered their fathers’ nakedness [the nakedness of mother or stepmother]; in you they have violated women who are [set apart as ceremonially] unclean during their menstrual impurity [or after childbirth].

1 Thessalonians 5:22

Abstain from every form of evil [withdraw and keep away from it].

Hebrews 13:4

Marriage is to be held in honor among all [that is, regarded as something of great value], and the marriage bed undefiled [by immorality or by any sexual sin]; for God will judge the sexually immoral and adulterous.

1 Peter 2:11

Beloved, I urge you as aliens and strangers [in this world] to abstain from the sensual urges [those dishonorable desires] that wage war against the soul.