Brett Yount from Bing has confirmed a bug with Bing's SafeSearch filter in a Bing Community thread.
The issue is that when you set your Bing Search preferences to the SafeSearch setting of "Moderate Filter adult images and videos but not text from your search results," it doesn't seem to work as described.
It should only block out adult images and videos, but leave adult oriented text in the search results.
On Friday afternoon, Brett confirmed the issue and said a fix will come in March. He said:
I recieved word that this is a known issue with a fix scheduled for March.
I have not seen many complaints about this to date.
Forum discussion at Bing Community.