>>10695072same thing happens to cocks and literally every other part of the body you fucking idiot, why would you think pussy lips are any different
if a body part, especially a very soft, sensitive body part, is constantly being rubbed and exposed to friction, the skin's gonna get thicker, looser, and darker
my dick is leathery as fuck and lemme tell ya, it wasn't born this way. it's cause I beat that shit like it owes me money.