![]() The volunteers, who had varying shades of pale skin, agreed to subject their rumps to two weeks of daily tanning sessions that dosed them with ultraviolet A (UVA) and ultraviolet B (UVB) rays on par with London’s summer noonday sun. Because butt cheeks do not typically get much time in the sun, a team of British scientists asked 16 young healthy adults to bare their previously unexposed posteriors to simulated sunlight for one 1998 study. The studies that helped solidify these conclusions were relatively straightforward. That, says David Leffell, the chief of dermatologic surgery and cutaneous oncology at Yale University School of Medicine, is “completely meaningless” in terms of providing protection. For beachgoers, that means if a person would normally turn pink after 10 minutes in the sun, an SPF 2 base tan would theoretically buy her another 10 minutes-or 20 minutes in total-before she burns. A base tan only provides an SPF, or sun protection factor, of 3 or less, according to the U.S. In fact, it actually puts otherwise pale people at risk of developing skin cancers. ![]() In study after study they have found that a base tan affords almost no protection against future ultraviolet exposure. Scientists came to this conclusion after studying the tanned buttocks of dozens of volunteers. ![]() Simply put, the benefits of being sun-kissed are not even skin-deep. But soaking up the rays to acquire a so-called “base tan” does not fool the sun or a tanning bed. As the weather warms, many of us would prefer to look like we passed our winter days lounging by the pool instead of hunched before a computer screen or lab bench.
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