It may be annoying to some but it was smart move on Nintendo's part. One of the characters is listed as 17, and is the Gavure Idol. And that is below age in a lot of countries. And before someone say it's just underwear, in the US they use to have all ages of underwear models until the laws changed and publishers got into trouble for having children in underwear. So they removed them. I think the matter was litigation and not being arrested for pedophilia, they didn't want people suing them.
So it more of something to legally protect themselves from having litigation brought up because of it, so the problem is more of the laws of said countries instead of Nintendo unilaterally deciding to censor something just for the kicks.