A close relationship
When you’re a teenager you want to be with your best friends all the time. When you were out with your girlfriends at a club you probably all went to the bathroom giggling together over the sink and touching up your makeup.
No-one needs to be this close to their friends whilst peeing though. Was there some sort of toilet quota that the contracts had to fill to complete the job? The only person I’ve ever had to be this close to whilst on the toilet was my 2-year-old during his clingy phase!