My nipples were the last piercing I got about 3+ years ago; my guiche (curved barbell) was first, then a lorum (captive ball ring) and finally the nipples. (straight barbells). Loved all the piercings and did have problems with guiche (one of the balls fell off and had to go back to piercer for another ball, luckily piercing did NOT close up), the same issue with the nipples, right nipple lost one ball TWICE so had to go back to get another ball (again lucky that piercing did NOT close up).
Certainly love being naked on a sling to show off all the peircings and yes, some tops did love to suck and bite the nipples...a great feeling!!!
Only problem I had were that the nipple piercings developed "bumps" around the barbell where it came out of the nipple; think it was catching on clothes....
About a month and half ago, had to remove the peircings as I was getting a MRI, so NOT metal in body...needed help getting the lorum off...loved that people saw all my peircings...LOL!!! Really miss teh piercings now... :(