Because drugs numb the nervous system, they are a way for a person to temporarily get rid of unwanted feelings like sadness, boredom of fear. Sometimes, in an emergency, drugs are needed so that an operation can be performed or when there has been an accident.

However, drugs block off ALL sensations or feelings. Eventually any kind of feeling becomes harder to experience. That includes sexual feelings also. The person feels less alive, and he may act like he doesn't care about anything or anyone around him.