sexual abuse by aid workers
Early last year, a report chronicled allegations of sexual abuse of refugees by aid workers and peacekeepers in camps in West Africa. Here is an article that provides an overview of what has been done since that report was released ... and the piece also argues for the creation of a humanitarian watchdog to take in complaints of wrongdoing.
Here is another piece on the UN's response to the issue of sexual exploitation in Bosnia and elsewhere. And here is another piece that has a few more stories about peacekeepers and sexual exploitation.