Do you have that line down your back?

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Do you think it's sexy?

I don't have it but my mom has it. When I was little I used to like it and I used to think that when I grow up I will have that too. But I'm all grown up now, and I still don't have that. I feel like I'm still a little girl because I don't have that. Silly, I know, but seriously, why do some people have them and some don't? My mother is overweight and has never done any form of exercise except swimming about 3x a year and badminton twice a year, so I don't think it has anything to do with excercise or being skinny.

Is there even any name for it?
Do you have that line down your back?
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