Acharei-Kedoshim is a combined Torah portion that contains many laws related to purity and morality, including several laws prohibiting incest and other deviant sexual relations. These portions also mention other offenses, such as cursing one's parents and practicing witchcraft.
The Noahide commandments are based on the fact that all people are created in the image of G-d and are therefore obligated to follow His moral guidelines. In the context of the Noahide laws, adultery refers to sexual relations between a married person and someone who is not their spouse. The prohibition against adultery is one of the seven Noahide laws. The Noahide laws emphasize morality and the importance of maintaining the sanctity of marriage and family life.
A Gentile is forbidden to have relations with one’s mother, one’s father’s wife, the wife of another man, another male, a maternal sister, and an animal of any sort. All of these, are not permitted according to the 7 laws of Noah even if done temporarily. These Forbidden relations are not permitted even if the ruling government recognizes any of them as legal or something common.
For Noahides, adultery is considered a capital offense and has negative consequences both for the individual and for society as a whole. Noahides are required to uphold and understand the sanctity of marriage and family life as a key to happiness. G-d created the world for the purpose of settling it and in order for it to be settled these laws of sanctity are crucial. A settled world is a basis for creating a dwelling place for Hashem of which the infinite light will be revealed in the coming redemption.
Rabbi Moshe Bernstein is a writer and a Community Rabbi in Netanya, Israel. He believes in making connections between the Jewish People and the Noahides worldwide in order to share and enhance the knowledge of the Torah's Universal Code for Humanity and fulfill Isaiah's Prophecy 11:9 " And the world will be filled with the knowledge of G-d as the waters cover the oceans".