The same compulsive behavior that characterizes other addictions also is typical of sex addiction. But these other addictions, including drug, alcohol and gambling dependency, involve substances or activities with no necessary relationship to our survival. For example, we can live normal and happy lives without ever gambling, taking illicit drugs or drinking alcohol. Even the most genetically vulnerable person will function well without ever being exposed to, or provoked by, these addictive activities.
Sexual activity is different. Like eating, having sex is necessary for human survival. Although some people are celibate — some not by choice, while others choose celibacy for cultural or religious reasons — healthy humans have a strong desire for sex. In fact, lack of interest or low interest in sex can indicate a medical problem or psychiatric illness.