I have had a number of questions about what was offensive in my writing. Here is exactly what I was told:
At the beginning of the year we changed the rules to refuse stories with characters under 12. But after the intense discussion on the site's discussion board, we finalized the rule changes on September 18th, 2011 to require all characters having sex in stories to be 14 or above (the lowest age of consent).
Sorry for the inconvenience.
You can find the work that generated this response here