@Rhodesian_YuKari @Groomschild A lot of the time she can't tell you why. There's horny rationale like making it feel better for oral (for the guy/tongue piercing) but you never hear that from girls when you ask.
It's just this ineffable signaling thing that at whatever point she decided she wanted to be a girl w/ piercings. Maybe she wants to feel like she's in control, rebel against her disapproving father (or absent entirely). I find the desire to be the "cool girl" is large in these girls, lots of the scene/emo/goth chicks were young normies when they saw some older girl on her wavelength, and she fantasized about being cool, confident, beloved by guys
Getting dumbass piercings is just a step in morphing herself into that hypothetical ideal. What's very apparent when you talk about it is how out of tune women are with men. It means entirely different things to them than it does us, and they cannot believe us when we say it's gross and nasty.