In the test data set, and 69 of the nipples were classified as visible and invisible, . The curves were plotted against boundary point Bx, where x=1, , n B,nB. If you have/had your nipples pierced, do you wear curved jewelry or straight? When my boyfriend got his pierced, they put straight barbells in afterwards. 2 Nov Dangerous curves ahead! Kim Kardashian flashes nipples in tiny crop top and hip-hugging skirt as she wows at Jimmy Kimmel Live!.