Getting someone's hair caught up in your tender zones is a workplace hazard in the business of sensual kanoodling. You put your face here, your hands there, a pillow here, and eventually things end up in exotic locations. It's not a big deal for the most part. And although every subsequent time you pull a foreign hair out from your crack you're always just a little surprised to see it, it's like the surprise you feel when you see there's still one beer left in the fridge.
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It's like Christmas had a baby with kung fu movies and you can drink it.
All this being said, I defy you to present any other situation you will ever find yourself in that would not lead you to squeamish, awful discomfort upon finding someone else's hair anywhere near your genitals. If you hit the shower at the Y and get even the barest hint of an idea that someone else might be thinking of letting their hair get near you, you'll clench up tighter than a clam being attacked by an octopus.
If you ever discovered one of your friends' hairs in your ass, you'd be rightly mortified. I'm going to assume women would handle this situation differently from men; perhaps they'd even share the story and laugh about it afterward, while most dudes would engage in some serious panic scrubbing while they desperately tried to piece together how such an unfortunate thing could have occurred. Of course women are also more likely (in my experience) to end up finding an errant pube on the soap or the toilet seat, as opposed to a long head hair choking the life from their junk, so maybe that's the trade off, but at least it's still arguably familiar. If you just run afoul of a strange hair, forget about it. I found a stray hair on my jeans after being on a bus once and I rubbed my entire body against a brick wall to get it off rather than touch it because in my mind everyone I don't know likely has crabs that have herpes. Is that normal? Probably not.