User blog comment:Aetherium/Question/@comment-1235-20130304234846

Not a romantic relationship. Kora was mostly the object of Iolaus's humorous affections, while Hercules was generally only attracted to guest stars (Cyane, Nemesis, Mila).

Hercules was the only one who knew of Kora's status as the Huntress, and they developed a pretty good friendship over the series.