Oh! Well, they're significant in that they are a sign of my species. And they do differ slightly from one person to the next. Some spots are obviously more attractive looking than others. At least, I think so. i think mine are above average
My tolerance for pain? Uhm, well, you know, I haven't really pushed that to the limits. But the joining was a little painful. And I have been stunned by a phaser before. That's never pleasant.
You have a tattoo that says science? Wow! She must have been a very impressive lady.