How do I teach a child to stop peeing in the sink?

rachel

Jokes! My 22 year old husband pees in the bathroom sink! At first, he told me it was only when I was on the toilet and he couldn’t wait. But he’s literally using it as a toilet all the time. There’s always splashed of pee all through the sink, and it stinks!

Even if he did wash it down, I don’t particularly want to brush my teeth or wash my hands in there!!!

I’ve told him multiple times to stop being feral, but he continues to do so! What do I do?!?!