The symptoms of unhappiness are widely variable and are often seen as mental illness. Glasser believed that "pleasure" and "happiness" are related but are far from synonymous. Sex, for example, is a "pleasure" but may well be divorced from a "satisfactory relationship" which is a precondition for lasting "happiness" in life. Hence the intense focus on the improvement of relationships in counseling with choice theory—the "new reality therapy". Those familiar with both are likely to prefer choice theory, the more modern formulation.