While it's tough to say exactly how many women sprout hair around their nipples, the phenomenon is "fairly common," says Dr. Ross. She estimates that it affects 5-10 percent of women and can become more prominent with age. "No Playboy models have it around their nipples, but they also don't have hair anywhere else," Ross says. Nipple hairs are harmless—for instance, they won't hurt a breastfeeding baby. In fact, some experts advise against plucking out nipple hairs if you're breastfeeding in order to prevent infection, Dr. Ross says.