[Cold Heat]

So, adultery laws are gone.

Audultry laws are related to the institution of marriage and justifying divorce in CIVIL court. It is not a criminal matter.

[colorado tanker]

Adultery used to be a criminal matter in almost all states, along with sodomy and seduction. Most states have repealed those laws, but not all. All would appear unconstitutional now. Adultery is grounds for divorce in "fault" states, but is unnecessary in "no fault" divorce states.