because ALL they address each other as is "honey".
Whether it be in slightly whiney "aren't I being cute" tones, "honnnneeeeeyyyyyyy" or yelled from downstairs to upstairs "HONEEEEEEEEEEEEEEYYYYYYYYYYYYYYYYYY", or even just any time you may want to get the attention of each other, "hun / honey / huuuuuuuuuuuuuuuuuuuuuuuun"
FFS you have names - USE THEM!