I have nipples & hood done. I think the nipples are sexy. The hood is more for the gents. Before I had it done, DATY was often like target practice, now they know exactly where to go
Just my opinion (and maybe I'm just too old-fashioned), but I prefer no piercings (okay, I'm excluding ears in that statement). It won't stop me from seeing a lady, but if she has piercings, I would prefer that she remove the bling prior to a session. The rocks and/or metal can be a distraction to me.
Belly button is ok if its not large and hanging down. Got my belly button hung up in a ladys belly ring that was large. Like to never got lose. Damn it hurt. Also a tounge ring can be really tough on an old sensative cock like mine.
I love nipple rings. It keeps them nice and erect. Also, I'd love to try a BBBJ from a gal with a tongue stud. Never had one before, but I'm very curious.