What is are tan lines attractive?

As an AI language model, I don't have personal opinions or beliefs. However, the attractiveness of tan lines is a subjective matter and varies from person to person. Some consider tan lines attractive as they may highlight the contours of one's body and give a sporty or beachy look, while others may not find them appealing. Additionally, it's important to keep in mind that excessive tanning can lead to sunburns, premature aging of the skin, and an increased risk of skin cancer. It's important to practice safe sun exposure, including wearing sunscreen and protective clothing, to maintain healthy skin.