Quote from base_coat
is actually a shoujo. It was serialized in Wings.
I think BL is allowed as long as it is published in a josei magazine (meaning not something not exclusively BL).
The problem is that many shoujo/josei titles are mislabeled on this site. During the shoujo poll, Antique Bakery was definitely labeled josei because I remember checking and deciding to wait until the josei poll to vote for it. Until recently, Fujoshi Kanojo was also labeled josei, so I can see why people would nominate it here. (Cat Street, however, has always been shoujo...)
To add to the confusion, about half of the titles in Melody have been labeled josei and the rest shoujo.
I'll go out a limb and pick my five, but who knows whether they are really josei:
Ashita no Ousama
Seigi no Mikata
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Reading: Kingdom, Sangokushi, Historie