Maintaining one's figure at any age is a challenge. Those who have an appropriate sense of beauty and are strong-willed enough to put in the effort will always have a beautiful and slender figure. Being able to maintain one's figure in the sex industry, a job that requires physical exertion, is a true sign of professionalism. The more sexually active and lecherous a woman is, the darker her nipples become. Black nipples are a sign of maturity.