@siracusa An age back, I got individually monogrammed bathroom cups for myself, my partner and our kid. My partner stared at me and asked "what on earth would I use this for?" and at that moment I realized that there is no mystery greater than other people.
@siracusa Mine does not look exactly like this, but I have something in this class. It holds two cups (upside-down), two toothbrushes, and has a cup-like divot for the toothpaste tube. It sticks to the mirror with a suction cup. I think we got ours locally at Daiso.
https://www.aliexpress.us/item/2251832673791930.html
Comments about how often cups are washed seem like they're coming from a planet where this isn't all taking place in a room filled with cleaning supplies, or where bathrooms aren't usually cleaned on a regular and frequent schedule.
Then again, my current house does have a few things I haven't always had: the toilet is separated from the sink area by a wall, and we don't use the dishwasher in my house except after large parties: we wash dishes by hand after every meal.
Oh yeah, I almost forgot about the comment that complains about toothpaste taste... during a process in which one scrubs the inside of their mouth with toothpaste. Again, it's possible to *wash* cups if they're conveniently near a source of water, but even toothpaste-flavored water seems like it might work out while brushing teeth!