pff

I think it depends on the person and the place.

I think he really doesn't care. He only really cares about Kazuki.
Wait... I just had a thought... What if... Oh, just imagining it...ლ(´ڡ`ლ)

Uhuh, sorryΣ( ￣□￣||). I just remembered something. Chiharu, when people ask him if he doesn't cre about something/ doesn't think it's wrong, he just answers 'Kazuki-san doen't mind/care'.
So, what if Kazuki said something like 'Don't let others see you naked'?
I can only imagine that some time after that someone sees Chiharu naked (or just sees a little more of Chiharu's skin). Then, Chiharu goes 'Oh, no, Kazuki-san said not to...', he disposes of the other person. Then he just calmly goes like 'Now no one has seen my naked body'.(≧∀≦)