Mine are the other way around.
Momo is my luvey dovey chubby mama's boy. Mimi will only give me kisses when she 'feels like it'. Hehee & it's exactly 2 licks on the nose & she turns her head! But...when she feels like being sweet, she won't stop giving kisses!
I think it's their personality or 'mood', but I'm also interested to know if it has anything to do w/the way they were socialized as wee pups, or something else.