Nipple jewelry has been used to show signs of strength by guards of Roman Caesars. Some historians says that Victorian women would pierce their nipples and hand a chain on them. Regardless, nipple piercing are not only very elegant piercing to see, but also rather titillating to the wearer. The smallest jewelry men should consider is a 14g. Any thinner might grow out or tear and leave a scar if played with too hard. Women need slightly thicker jewelry because their nipples are not only larger, but also subject to abuse from bras, etc. Generally a 12g is sufficient. Also you might want to consider Barbells instead of Nipple Rings since they put less pressure on your nipples and generally heals quickly.
How nipple rings are measured:
click to enlarge
