On the Burning Crusade Classic Patch 2.5.3 PTR, the female NPCs in Karazhan have been updated to include male models. This change has already been implemented on retail, following many changes in Patch 9.1.5 addressing innuendo references.Wanton Hostess can now be a Male NPC This change is being implemented alongside the possible inclusion of a Male Incubus model, both changes that were celebrated on retail World of Warcraft.
Read more on wowhead.com