Technically, a sexless relationship is defined as when a couple has sex less than once a month or less than 10 times a year, says Dr. Epstein.

Is it OK to cheat if you are in a sexless relationship?

Its never OK to cheat on your spouse, even if you are in a sexless marriage. Work with your spouse first to try and fix the issue. If they cant or wont change, then consider divorcing them to be with someone else rather than having an affair. There is no justification for cheating, ever.