A sexless marriage is one in which intimate partners are engaging in sex once a month or less. Causes range from health concerns to communication issues. In this article you will learn the most common causes and how to get beyond coping with a sexless marriage. There is no right number that defines a healthy sex life, and surely not everyone benefits from more sex, but good sexual health in a relationship demonstrates true intimacy and helps to build the self esteem of each of the partners.