Its a very common piercing.
If you have small jewelry in it, most people don't notice.
With your hair down, its easy to hide, especially with a small stud.
Most people don't assume anything about it anymore.
Super old people or very conservative people might assume you are very outlandish, but thats getting to be pretty rare.
My first piercing, other than my lobes, was a helix piercing. Because this was the first 'body piercing' I got, people asked me if I wanted more, but thats it.