By Matt SmithWhile doomsayers bemoan America's ongoing wars in Iraq and Afghanistan, researchers at the University of California at San Francisco Medical Center may have turned up a brilliant silver lining.Thanks to desperate recruiting methods required to staff those wars, the U.S. Marines may be turning military service into a male sexual fantasy land, where recruits are paid actual money to cohabitate with drunk, stoned, horny teenage girls.UCSF scientists tested and surveyed 2,157 female U.S