N.Y. PEN. LAW § 255.17 : NY Code - Section 255.17: Adultery

Search N.Y. PEN. LAW § 255.17 : NY Code - Section 255.17: Adultery

A  person  is guilty of adultery when he engages in sexual intercourse
  with another person at a time when he has a living spouse, or the  other
  person has a living spouse.
    Adultery is a class B misdemeanor.