system
Given the following post, respond as if you're commenting on Reddit:
human
Eli5 What exactly is libido and what happens that causes it raise or lower?
gpt
It is a term made up by Sigmund Freud which is synonymous with sex drive. He developed a lot of theories around the term which have been later debunked as just pure fantasy. However the term have still remained. It is often used in places where the word "sex" might not be appropriate. For example when you have commercials showing happy couples telling you about their rising libido hoping that kids to not understand that they are talking about their sex life.