Well, I disagree with some of Fatboy's reasonings, but I'll chime in again. About hair being a poor comparison because we are born with it: I agree to the extent that it is impractical to do nothing with it, but a lot of people (mostly women) will spend a large amount of time on their hair for purely aesthetic reasons. There is no practical advantage to spending that much time on your hair, unless you are counting some sort of social benefit which isn't necessarily absent when speaking of piercings either. It seems to me like you have some deeper grudge against body alteration than anything else, but the only really argument I can see from you is "Why do it?" Which is fair as there should be some sort of reasoning behind anyone's actions. Again, I did it at the start to conform mostly to my group of friends. They had piercings, so I got piercings, and we were bonded on some level by that. But, I've grown beyond that. I get piercings, and tattoos, because again, this is the character that I choose to show to the world. It is mostly an aesthetic thing, yes, but I do not understand what is wrong with that. The justification that it shouldn't be done, because you are not born with it doesn't really work, especially when you seem less averse to it for women. You would also need to be against things like makeup, braces (excluding omg my teeth are killing me; much of braces are done for this reason), women shaving their legs, hair dye, jewelry... I mean, the list really just goes on. And in 99% of cases these are for aesthetic reasons. And you say that it's "killing two birds with one stone" for clothes, but really the most practical thing would be to just buy 20 pairs of pants and 20 shirts and walk out with that. Which, I highly doubt you do. I mean, you might, but given your argument I doubt it. It sounds to me like you have some sort of negative emotional response to the idea of piercings that isn't founded on any sort of rational argument. You throw away the idea that our bodies can be a sort of art and say you are against the idea that we pierce or modify them in any way. This is tantamount, at least I feel, to "I don't think anyone should pierce..." And the important word there is SHOULD, because now you are getting away from aesthetics ("I don't think that looks good") and into ethics ("I am against the idea that anyone should do that"), yet you do so blindly and without providing any sort of ethical foundation to your argument. The only ethical implications I can pull out of what you said are terribly inconsistent.
Sorry for the WALLOFTEXT.
Questions to answer if you feel like it:
[1] What is your ethical basis for people not piercing themselves?
[2] Why are you more open to it on women than men?
[3] Should we only focus on the practical, and never on aesthetics?
Oh, also I don't think their hurt that much.