list of acceptable body modifications:
breast / butt / hip / etc implants (reversible)
lip filler (temporary)
corset training (temporary)
ear and navel piercing (temporary)
anus, nipple, teeth, skin lightening (temporary)
list of unacceptable body modifications:
https://en.wikipedia.org/wiki/List_of_body_modifications especially anything involving cutting off parts of your body (nullification)
rule of thumb is that if it is permanent you should not do it
