The mouth of forbidden women is a deep pit; he with whom the LORD is angry will fall into it.
Proverbs 22:14 ESV

This is about much more than a "forbidden woman". God arranges for people, cities, and nations who rebel against him to be seduced by their own lusts into manifesting the evil within their hearts into outward sin so that they can be judged. The forbidden woman is a seductive ideology, a temptation disguised as a blessing, or some other lie that lets you believe whatever you need to justify your sinful desires.