Do you call your partner by their first name or with a pet name?

Jean-Marie_Céline
Do you call your partner by their first name or with a pet name?

I generally call my girlfriend both with her name and pet names roughly equally, but I noticed she almost only calls me with pet names and diminutives of my name.
She calls me by my first name only when she's serious or upset about something.
What about you?
Do you call your partner by their first name or with a pet name?
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