no one
You can wear jewelry while getting a tattoo. I wear lots of it and have 14 tattoos and have never taken off one piece of jewelry while getting a tattoo.
They would wear wooden or shell type jewelry.
One would need a jewelry travel case if he or she wanted to transport jewelry while traveling. It would be a convenience to have some kind of case that puts all of one's jewelry in one place.
Gold electoplate will not likely "tarnish" but it can wear off your jewelry especially if you wear it alot or expose it to harsh chemicals. That's one reason its great to purchase jewelry that comes with a lifetime replacement guarantee then if the plating wears off you can get them replaced!
Jewelry did not have any particular significance in Rome except that the woman who wore it was wealthy. A man was not expected to wear jewelry except for maybe one ring in addition to his signet ring.
Yes you need to be one.
They could wear one for several reasons. One being they are a crossdresser and love female underwear or they are transgender and need to wear one and last but not least, for medical reasons like gynocamastia. You the medical condition that some men have. It is the development of breast tissue in men and while I do have that, they can hurt when not in a bra.
Glass jewelry can be found in a variety of places and retailers, big and small. You can also try your local pawnbrokers, as people do sell jewelry they don't need to them if they need money.
if you don't need one then don't wear one !
Possession of bone for medical uses ( I believe that this includes display, even if it is with jewelry ) is completely legal in the United States. However, some states may rule jewelry as an artistic use. It is illegal in some states, New York being one of them, to possess human parts for non-medical use.
You don't wear tapers as jewelry. They thin out the middle of your lobe which may stop you from stretching up later. If you're at 12ga, you buy a 10ga taper. You only need one because after you use it for stretching up, you put a plug in.