Personal jokes transfolk might giggle with me over.
My partner likes to talk about how he enjoys my topside, and I just keep reminding him that they are just misplaced testicles. (And yes, they are much bigger than his own.)
Gift notes to my partner from steam purchase.
"Ya know there's a half off sale over here waiting on ya." Signed, "Your 1/2 boyfriend"
"Want to see if mines bigger than yours?" Signed, "You know they are"
(In no way are these intended to offend, he blushes like a cherry.)
Afterthought: Yes in our relationship, I'm the one with bigger balls to speak my mind and express myself, than he is. He gets easily flustered when someone ticks me off and I'm off to the races to chew them out for it.