Sweet plugs man. I remember when you posted them the first time. Funny how people can be so passionate about their opinions of what other people do to their own bodies.
To ask the question "Why?" is to open a huge discussion about the human condition. Why does my 19 year old step son enjoy cutting himself? Why do i have a tattoo that covers the entire back of my right hand, and steel hoops in my nipples? Why do people drink coffee? Why do folks smoke cigarettes? or drink alcohol? None of these things are very "good" for people to do, but we do them anyway.
Not to mention, If you REALLY want to get technical about it, getting a haircut, or shaving, or clipping your nails even, is a body modification. Some are just more permanent than others. There are people in the world that would freak out because most American men don't have a certain piece of skin that was there when you were born. To us, that is normal. It is removed before you ever even realize it is there so you know life no other way.
I personally don't understand the whole "Goth" thing, or the "Emo" business,But when i grew up, i was ALWAYS getting yelled at to pull my pants up. I still "Bust a sag" if the situation is right, so I keep my mouth shut when i see a kid with jet black hair all combed over half of his face. Some guys used to get yelled at for wearing leather jackets, and grease in their hair, and driving fast cars, and listening to the "Devil music" of Elvis, and Buddy Holly, and other rock icons. Then it was the "peace loving hippie hopheads".. Then came the urban gangsters with their sagging pants and the loud bass.. Now it is Body mods, and trying to look like a japanese cartoon character. Remember, back when you were young, there was a group of old geezers somewhere talking about how big of a slacker you were and you vowed to never be that old man!