Was it good for you? Yes, as long as we're doing it at least once a week. iStockphoto hide caption toggle caption iStockphoto Shots - Health News Is Sex Once A Week Enough For A Happy Relationship? November 18, 2015 A study of thousands of people, most in committed relationships, finds that having sex about once a week correlates best with happiness and well-being. More didn't turn out to be better.