In a new photo, Kendall Jenner wears a bikini alongside Kourtney Kardashian and friends. Online trolls began body-shaming the model and calling out her tan lines. Enchanting beauties and erotic nudes of pure sensual sexuality posing in captivating pictures and videos. The most beautiful naked young . A tan line is a visually clear division on the human skin between an area of pronounced comparative paleness relative to other areas that have been suntanned by exposure to ultraviolet (UV) radiation.