Girls, what does it mean when a girl keeps staring at your crotch area?

Anonymous
I was wearing normal clothing, a t shirt and grey sweatpants and picked up a friend of mine, I was driving and she kept wanting to switch the lights on for whatever reason "to see me while we talk" eventually we park and turn the lights on and do talk, but every now and then her eyes would drift down there for whatever reason and it happened a lot. Why did she keep looking there while we talked? Does it mean anything? Is it good/ bad?
Girls, what does it mean when a girl keeps staring at your crotch area?
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