Sorry to jump in but it's hard to leave you guys and this post is interesting!!
I call DH love (amor), darling (cariño) and "daddy" (papi)
He calls me the first two; "mummy" (mami) and "big bum" (culona) because he says he loves my butt. Even jokes around and says "you know I married you for your bum, hehe".
The mummy and daddy thing might sound like south americans call each other in relationships but it's actually due to a little boy I met that used to drop things and then say in a really cute and funny and inocent voice: "look daddy, it fell, did you see it daddy, did you see it?" And I started telling DH that in any funny context and it just remained!!