Sexual dysfunction is often caused by a failure in some aspect of the complex system which provides the basis for our sexual behavior; the limbic system. Very little is known about how this system operates but it is believed that it depends a great extent on how we respond to sexual stimuli with sexual behavior. It is possible that the limbic system is more easily aroused in some people than other, and therefore the propensity to develop a sexual problem may differ from person to person. Low hormone levels, drugs, neurological conditions, depression, stress and psychological problems all contribute to the possibility of sexual dysfunction. This section is designed to give an overview of sexual dysfunction, both physiological and psychological.