If a bigger guy is comfortable of who he is as a man, women can take certain liberties with their nicknames for them. Of course, that is after you are very comfortable being with each other and have a bond with him that is unique to your situation. I have received certain cutesy names over the years that only that my particular girlfriend could get away calling me by that. If he has a cutesy nickname for you, chances are that you are golden by giving one back in return.