Why are humans so odd when we wash. I wash after I have eaten. I wash after a human has stroked me, particularly if I didn't really want to be stroked. I wash when I feel I have nothing better to do. And I wash when I feel embarassed or upset. I was doing this the other day when my humans had guests. Perhaps I was a bit noisy. And perhaps I did expose my tummy. But so what? As you can see I have a particularly beautiful white tummy and I can't see anything wrong with it. Or the bits lower down, come to that. Humans are so prudish.
First of all, humans don't wash enough anyway. They only wash two or three times a day and instead of using their clean tongue they throw themselves into a huge bowl and wallow in their own dirt. Or they pour water on themselves while standing in a kind of cabinet. All very odd and often very unhygienic. Frankly, we cats are cleaner than they are.
Is it envy that makes them embarrassed when we wash in front of guests? Or a feeling of inferiority? After all, if they wanted to clean up their tummies with their tongue, most of them are too fat and unflexible to be able to do it, even if they did have a longer better tongue. Maybe that makes them feel uneasy. But you are right. They are embarrassed in front of other people.
Rather than let this get on your nerves, Jaffa, why not enjoy teasing them with it. See if you can jump on the dinner table and wash your backside in front of their very noses?If that isn't possible, choose a chair nearby and do it. Make a real performance of it - licking, pulling the hair slightly, breathing heavily and generally making slurpy noises.
Use the litter tray with a lot of heavy scratching which can be heard even if the tray is out of sight. Then walk back into the room for a thorough wash "down there". This is best done with guests because your own humans are used to this and, if they were on their own, would think nothing of it. But it's fun to see if you can embarrass the guests - their eyes flick on to you and then flick away and a sort of prim expression comes on their face. Then if they are embarrassed, your own humans will often get embarrassed too.
What else to do with washing? Well, it's fun to do it on the bed in the early hours of the morning so that you make the bed shake. Or just near your human's face on the pillow. I'm sure the cats out there will have their own ideas about how to use washing as a way to tease their humans.