I'm not really a fan of modifying my body with piercings or tattoos or anything, and it's hard for me to feel like I completely relate to anyone who would want to. Shaving isn't so permanent, but, for example, seeing a girl who doesn't shave her underarms makes me hypothesize that she might share that sentiment, so I like it by default. I'm not really thinking about hygiene or physical appeal when I consider that.