This episode is all about sex, drugs and alcohol. Kate and Tamal investigate a new male contraceptive at the University of Wolverhampton and a supposed hangover-free version of alcohol called alcosynth. Also, a group of women take a month off the booze to see the difference it makes to their health. The results are surprising and so are some of the women's reactions. Morland Sanders trials the smart drug Modafinil. He also looks at whether it's time to lift the ban on medical marijuana.