SparkyDog said:
It can be hard for some people to say things. When I was a kid I'd write my mom a note / question and dive out of the room while I wait for an answer. Some don't grow out of that state of communication.
Im on the fence for telling them.
Usually it doesn't go like you want. Imo if walking around in diapers in front of them is your end goal you're really forcing your thing on them and making them accept your lifestyle. Generally with roommates you work to make sure everyone is comfortable.
Once you say it you can't take it back.
Id leave the diapers to your room and your own space.
but that's just me
I had the same issue when I wanted to tell my mom but couldn't and wrote a letter but she found that backstabbing somehow , she preferred I told it straight into her face, but regardless she didn't like it either way.
Only decades later when I really needed them she accepted it.
If the OP needs them for medical reasons or not, I'd simply not tell and stop placing them around in plain sight.
Only if asked head on I'd tell, because then the other person is prying and the OP would not "force" it upon his roommate.
Because it's like you said, once you tell someone, you can't take it back and if his roommate really doesn't like it, then there a big problem.
If he only tells when being asked and the reason is medical then it's kinda obvious the OP would want to hide it but right now it's uncertain, like others said, since the roommate didn't say anything chances are high he respects his privacy and leaves it at that, until more buttons are pushed, and that is undesirable.