body modification

I dont think there is much wrong with tatoos piercings etc. seen as they do not harm or hurt anybody. It depends upon peoples own preference on what they do to their own body(although some things are quite extreme as this picture shows.) This website (http://www.bodymod.org/home.aspx) shows all sorts of weird and wonderful pics of people sporting painful looking piercing and tatoos. I have found the following list from www.wikipedia.com which illustrates the most extreme body modification;
Anal stretching
Body piercing -
Branding - controlled burning or cauterizing of tissue to encourage intentional scarring
Breast ironing - Pressing (sometimes with a heated object) the breasts of a pubescent female to prevent their growth.

Eyeball tattooing - Injection of a pigment into the cornea.
Ear shaping (which includes Ear cropping , Ear pointing or "elfing")
Extraocular implant (eyeball jewelry) - The implantation of jewelry in the outer layer of the eye.
Nipple removal
Nipple splitting
Scarification - cutting or removal of dermis with the intent to encourage intentional scarring
Scrotal implants
Subincision - splitting of the underside of the penis, also called urethrotomy
Tongue splitting - bisection of the tongue similar to a snake's

Trepanation- binding of the waist and shaping of the torso
Cranial binding - modification of the shape of infants' heads, now extremely rare
Foot binding - compression of the feet to modify them for aesthetic reasons
Non-surgical

elongation of organs by prolonged stretching using weights or spacing devices. Some cultural traditions prescribe for or encourage members of one sex (or both) to have one organ stretched till permanent re-dimensioning has occurred, such as:
The 'giraffe-like' stretched necks (sometimes also other organs) of women among the Burmese Kayan tribe, the result of wearing brass coils around them. This compresses the collarbone and upper ribs but is not medically dangerous. It is a myth that removing the rings will cause the neck to 'flop';
Stretched lip piercings - achieved by inserting ever larger plates, such as those made of clay used by some Amazonian tribes. s part of a ritual for some countries.

Although that seems quite weird and extremely painful as long as it is a personal decision to modify their body I do not see a problem with it.