Once you become addicted, the natural desire for genuine, loving sex is overwhelmed by the addictive compulsion to escape. When sex is used as an escape it is not really a pleasure. It's a relief. There is a profound difference between pleasure and relief. Relief is like banging your head against the wall because it feels good when you stop.
Pleasure is the enjoyment of a healthy mind and body.
The difference between addictive sex and natural sex is the difference between screwing and making love. When you screw someone you use their body to provide you with a thrill. When you make love you are emotionally involved. Your body is an expression of the feelings you have for that person. Their body is an expression of the feelings they have for you.