This reply is a bit buried on this thread, so thought I'd post here for others to see - Justine's response, which I think is a good outcome (though it feels a bit sad to me that it's take almost a month of threads on Site Stuff to get here).
www.mumsnet.com/Talk/site_stuff/4749810-references-to-underage-sex-on-sex-board?msgid=124186283#124186283