Apparently Dead or Alive will process tans, including tan lines, on the girls as you play through the game. If you change swimsuits, the tan lines will be visible, and it will calculate tham all in real time.
All I can say is…WEIRDED OUT! I guess if you really appreciate virtual women with balloon like boobs, the tan lines might make your fantasy a little more real? Creeeeepyy….
[url=http://xbox360.ign.com/articles/727/727502p1.html]DOAX Gets Tan Line Technology[/url] (IGN, thanks to Ben)