What relationships are prohibited?
There are a number of prohibited relationships in Judaism. The Torah sets forth a list, and any community cannot, by custom, violate a Torah prohibition. For example, a man cannot marry certain close blood relatives, the ex-wives of certain close blood relatives, a woman who has not been validly divorced from her previous husband, the daughter or granddaughter of his ex-wife, or the sister of his ex-wife during the ex-wife’s lifetime. These are all enumerated in Leviticus 18. These include that one cannot: * Have sexual relations with one’s mother (Leviticus 18:7). * Have sexual relations with one’s father (Leviticus 18:7). * Have sexual relations with one’s father’s wife (Leviticus 18:8). * Have sexual relations with one’s sister (Leviticus 18:9). * Have sexual relations with one’s father’s wife’s daughter. * Have sexual relations with one’s son’s daughter (Leviticus 18:10). * Have sexual relations with one’s daughter’s daughter (Leviticus 18:10). * Have sexual relations with one’s da
