In my opinion, most of the case in Japan each side each one earing is acceptable, especially which are small about the size of less than tips of thumbs whether they are piercings, or else earings.
Especially, for more than middle aged and socially, to wear them a lot, or far larger ones is inclined to be hard to be accepted, and also to do on part of your body other than ears, such as lips, nose.
Some of youngsters in cities do so, though. I think it OK with you that you wear like the former way I wrote even in rural areas. Tattoos, however, has bad impressions even in cities.
Some do, though. Afte all, it depends on the person who looks at them.