Single ear with single piercing for me. I only have my right earlobe pierced (and my lower lip but that wasn't the topic). My story behind that is actually related to me being ftm trans, although weirdly so. Cause, being 14 at the time, I kinda had a hunch I might be trans but it was still far back in my head. However, at that age I had learned that some people thought that having just one ear pierced was a gay guy thing. And although my gender knowledge was quite limited back then, I did get to the conclusion that "if I was a guy, I'd obviously be gay" cause I liked guys. But at the same time I thought it would be a cool thing to do cause it was rare for a girl (or afab) and I was always a bit of a rebel without a cause.
Also, I got it at the same time as my best friend who also only had her right ear pierced, but for other reasons. We're still best friends as of today. Another trivia thing about it is that I'm almost deaf on my left ear, so me only having my hearing ear pierced is a good way for me to signal to others which side of me they should be at for me to be able to hear what they're saying.
I kept it and didn't get more ear piercings, but started stretching it last year. Now it's at 4 mm (or 6 gauge) and I plan to get it up to 12 or 14 mm (around 0,55 inch). I might want to get more piercings in the same ear later on, but keep my left ear unpierced. Cause I love asymmetry, and want to keep all of my body modifications on the rights side of my body or centered.