Girdle of Femininity/Masculinity

As an unsuspecting adventurer dons this unidentified belt his or her gender immediately changes to that of the opposite sex. And even though the item itself is not as unforgiving as its Pen & Paper equivalent (as the item is only cursed and can be removed by a Remove Curse spell or a shameful visit to your local temple) it's one of the earliest items the player will encounter, and as a new player equips it the effect serves its purpose quite nicely: It will teach the player to identify items before equipping them.