If your marriage promised exclusivity to each other, and you guys don’t practice ENM, your sexless marriage doesn’t justify adultery. However, your partner also promised to meet all of your needs but didn’t in a sexless marriage. If your partner intentionally denies you sex, they’re at fault too. But wrongdoing against another wrongdoing isn’t the answer. You might feel guilty or traumatize your partner. Adultery in sexless marriages hurts your physical and psychological health too.