Leviticus 15:33
for any woman who has her period, for any man or woman who has a discharge, or for any man who has sexual intercourse with a woman when she is unclean.
Leviticus 15:19
When a woman has her monthly period, she will be unclean for seven days. Those who touch her will be unclean until evening.
Leviticus 15:24-25
If a man has sexual intercourse with her while she has her period, he will be unclean for seven days. Any bed he lies on will become unclean.
Leviticus 20:18
If a man has intercourse with a woman during her monthly period, both of them are to be driven out of the community, because they have broken the regulations about ritual uncleanness.