Of course I made it up. We're discussing a hypothetical scenario here where OP is asking our opinions on the matter.
You're positive it's a rarity based on what exactly? Let's see that source.
Yes of course they should be cleaned after use just like you should regularly wash your hands, wipe/wash your ass after pooping, shower, brush your teeth, cover your mouth and nose when you sneeze, etc yet many people fail at these as well. There's lots of nasty people out there.
There's zero way to confirm whether the person with the sex toy has cleaned it properly unless you physically helped them with it, so I don't see any scenario where I would find this acceptable and I would be repulsed at the suggestion and implication of someone asking to use a used toy on me.
Or you could just not use it at all. Do you typically start your romantic encounters with a boiling pot of water and a second-hand sex toy? What exactly is the upside for the woman in this scenario?