The FBI is investigating Wikipedia's inclusion of a photograph of an underage girl on one of their information pages, WorldNetDaily reported. The company has defended their inclusion of adult content despites its ease of access for children, WND noted.
The offending photo is of an old Scorpion album cover that "depicts a naked pre-pubescent girl (appearing about 10 years of age) in a provocative pose. Her chest is completely exposed and a small crack is placed over her vagina."
There have been some complaints about the inclusion of images of graphic sexual acts - heterosexual and homosexual.
ValleyWag mentions these problems in a profile of Wikipedia's Erik Moeller, their number two who oversees content and was instrumental in the development of WikiYouth. Problem is guys you have no restrictions to the adult content on your main site. Even the porn industry requires checking age or having anyone logging in to commit to an age.
A warning before this content displays could be a good start.