Being an old fashioned old bastard I have long hated piercings and tattoos.
However, ironically the only two I remember who had pierced nipples were two of the best prossies I ever saw, namely Louise of Arabesque parlour Bury - the only parlour girl in my top twenty, and Elin of Minx Escorts. The latter, who unfortunately I only ever saw once, was, in terms of looks allied to service, probably the best girl I ever saw.