http://www.physorg.com/ en-us Physorg.com internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine. Black girls who use marijuana are more likely to engage in risky sexual acts and contract a sexually transmitted disease, a new study finds. http://www.physorg.com/news137154666.html Medicine & Health Tue, 05 Aug 2008 11:31:06 EST news137154666