The full meaning of this can be made explicit. AT: "The man who commits adultery with someone else's wife" (See: [[rc://en/ta/man/translate/figs-explicit]])
This is a polite way of saying that he had sex with his father's wife. Some languages use more direct phrases such as "has sex with his father's wife." (See: [[rc://en/ta/man/translate/figs-euphemism]])
Here God calls a man having sex with his son's wife a "perversion", a serious sin. See how you translated "perversion" in [Leviticus 18:23](../18/22.md).