Risen has been refused classification by Australia's OFLC, meaning it can't be sold at retail on the continent. Kotaku was informed by the game's Aussie distributor that the board was concerned by "sexual activity and drug use related to incentives or rewards." Ignore the fact that both of those concepts are directly related to teaching children how to succeed in business.
Why are we talking about children? Well, it's because Australia only rates games that are appropriate for children 15-years-old and younger. The US's ESRB summary of Risen notes that sex is implied but never depicted, while "wood reefer" can be bought, sold and used. That sounds a lot like high school.