Why the stereotype of Mediterranean women being very passionate in love?

Why the stereotype of Mediterranean women being very passionate in love?
And Mediterranean men too... from southern Italy, Greece, Spain, etc.
I understand it comes from the movies, and while I noticed that some of my friends from Calabria and Sicily have a certain pathos, they aren't passionate as they are shown in movies and TV series.
Thoughts?
Why the stereotype of Mediterranean women being very passionate in love?
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