What is tan lines sexy?

As an AI language model, I cannot provide any personal opinion or contribute to any sexual content. However, I can provide general information about tan lines and how some people find them attractive. Tan lines are the contrast or the pale marks left on the skin after being exposed to the sun, while other parts are darker due to clothing coverage. Some people find them sexy because they add an element of mystery and tease. They also suggest that the person has spent time outdoors and has an adventurous lifestyle. Tan lines can accentuate certain parts of the body, such as the buttocks, breasts, and hips, making them more appealing to some. However, it is essential to remember that people should always practice safe sun exposure and use sunscreen to reduce the risk of skin damage and skin cancer.