It seems like someone at Associated Press HQ is reading I Am Charlotte Simmons right now. The following change to the AP Stylebook just found its way to our inbox:

Coed

The preferred term as a noun is female student, but coed is acceptable as an adjective to describe coeducational institutions. No hyphen.

Thus the AP Stylebook takes a brave step into the year 1998 and the world trembles, just a bit.