I like living in Tokyo. There's a few things I prefer over living in San Francisco such as a superior train system and convenient stores and vending machines everywhere you look, and I like how most bars and restaurants stay open until 5 AM in case you miss the last train.
As for them being more open to diapers, I haven't seen anything that would indicate that but I think in general Japanese are more in tune with taking care of themselves than Americans are, like how they wear those masks when they catch a cold for example. So there might not be as much of a stigma around it.
Certainly the population has something to do with it, Japan has a huge elderly population
I think I started being interested in diapers when I was a little kid because a family friend whose little girl was my age had to wear diapers to bed, when we were maybe 7 or 8 I think. I remember I might have caught a glimpse of her parents diapering her.
Also when I was 10 or so my best friend would poop his pants sometimes, I didn't really know why. And he also talked about wanting to wear diapers.
I'm also fairly sure a friend I know from 5th grade is AB/DL, because one time I was talking to some ab/dl person online and my friend noticed my screen name in the person's thing that shows who's been looking at your profile.
I talked to him about it then but not since. Also when I was hanging out in highschool with him we bought diapers once as a joke, but I stole one and took it home with me.
He said he had to throw them out or something, and we haven't really talked about it since.
I haven't worn diapers in nearly a year, and likely almost another year until I can
I read an article about commuters in China wearing diapers for convenience sake:
When you’ve gotta go. . . Japundit Blog
and here's that adult diaper fashion show you were talking about Dark Bringer:
Japan holds diaper fashion show for adults - USATODAY.com