nipple piercings

good idea or bad idea? my boyfriend so badly wants me to get them done, he even offered to pay for it and buy me a new bra so i can be more comfortable. ive got 11 tattoos and 12 piercings. in your experience how painful is it?

*UPDATE*

I got my nipples pierced, honestly it was a 7 out of 10. But it was totally worth it, i love them. I'm glad i went through with it.