The word passion has gotten a bad reputation in today's use of language. Well, maybe not bad exactly, but at least lascivious. Passion is commonly used to describe movies which portray torrid sex or anger that is out of control. Both uses are titillating, but they miss the meaning of the word.
Passion comes from the Latin word passio which means suffering.
It has to do with emotionally focussed commitment which is so strong that it can bring suffering to the person who embodies it. Passion is the anguish of soul which accompanies single-minded devotion to a cause, a purpose, or a goal. Using passion to describe sexual lust or maniacal rage reduces the word to a fraction of its original meaning. Lusty behavior in sexually explicit material is shocking at first, but it readily becomes dull and routine. Its long term entertainment value is roughly equal to that of a documentary on hemorrhoids.