Ask a dermatologist what he or she thinks of artificial tanning or sitting in the sun for extended periods of time with or without sun screen.
Yeah, I know. You're arguably better off without sunscreen as wearing it may do little more that provide a false sense of security. You can't cover all of your body with sunscreen so, some parts of the body will be exposed for considerably longer periods than if no sunscreen was worn Even if you could get good coverage, the stuff wears off.