Why are panty lines on a girl sexy?

I'm a guy in my 20's and for some reason I'm really attracted to underwear lines on girls. This has been a thing for me since I was in high school. Whether it's shorts, jeans, Pj pants, or leggings. And when I say VPL I mean like full coverage panties or cheeky cut not thongs. Think Hanes multi packs. I think I just like the not trying hard to be sexy look.

A cute girl in casual clothes wearing big ole undies is sexy in an intimate way. For an example, I walked into one of my classes and this girl I have a crush on was at her desk bent over plugging her laptop in. Her hair was in a messy bun, she didn't have much makeup on, she was wearing a hoodie and dark grey leggings. She was positioned so that her butt was kinda sticking out in the perfect heart shape. I could see that she had her laundry day undies "granny panties" on beneath her pants.

Am I one of the only ones who likes this? Girls, are you aware when you do this? Do you get embarrassed if someone notices? Do you not give a fuck?

Why are panty lines on a girl sexy?
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