Is it ok for an adult to wear diapers?

Of course it is. Many adults like myself have medical issue the make bladder and/or bowel control an issue (bladder in my case). Without Adult Diapers I would be wetting myself constantly. Additionally there are those adults who wear diapers for fun (I.e. they choose to wear them just because). I don't see them as any "weirder" then people who enjoy lingerie or dress up, or any other thing that I would beat 90% of the US dose in their bedrooms behind closed doors.