http://blog.lipcon.com/category/cruise-line-crimes/cruise-ship-rape-sexual-assault
Just do an internet search on: Rapes on cruise ships. There have been several articles and news magazine stories about this subject in the last ten years. Many go unreported because it is extremely difficult to prosecute based on most happen in international waters.
“Statistics show that cruise ship sexual assault and rape is the number one reported crime on the high seas.”
Keep in mind, it not necessarily the crew. Many times it is between passengers that are drunk and men that use date rape drugs, AKA Joran Vandersloop from Aruba. Again, the perps know it is hard to prosecute them under international law and they will most likely get away with it.