Both.
However, there is a huge difference between cheating/sleeping around and being addicted to sex.
Tiger Woods is not addicted to sex.
Tiger Woods complained of having a sex addiction and that he slept with 15 women over the course of several years.
Someone with a sex addiction might sleep with 15 people in 15 days.
Here's a general definition of sex addiction:
Quote:
Sexual addiction is best described as a progressive intimacy disorder characterized by compulsive sexual thoughts and acts.
Sex addiction is a chemical addiction. When you have sex, your brain releases tons of chemicals that are very pleasurable. Obviously, since pleasurable things are good, you want more of it. Compulsive eaters don't eat to get fat. Drug addicts don't do drugs to destroy their livers. They do it to feel good.
You can define an addiction in several ways, but the these are the main points between enjoying something and it being an addiction: 1) Physio/psychological dependence (withdrawl symptoms from not engaging/consuming/etc), 2) Interferes with daily life (time spent doing something, obsessive/intrusive thoughts, etc).
Note that these aren't actual numbers or statistics, but to give you an idea:
Someone who is addicted to porn might search for it 4-6 hours a day. Every day.
Someone who is addicted to sex might search for partners several hours a day. They can have sex three times in a day and be ready and willing to go again.
When not engaged in the actual activities or searching (for a partner), they're constantly thinking about it - when they can get on the internet or go to a bar again or whatever.