I wonder how long I could go without shaving my armpits before my boyfriend would say something

Body hair’s cute.  Feels wonderful to a man’s fingers. (Maybe not boys till they grow up.)  If you want to shave everywhere, awesome.  It’s fun and it’s your decision.  If you don’t want to shave anywhere?  Also awesome and his loss if he can’t handle your fashion choices.  If you’re going to shave just a little?  Shave where you most like to feel kisses on bare skin.