Gender

The sex or gender of a character (male or female) is chosen when he or she is created.

Gender roles in Tibia
As far as we know, Tibia has no programmed adjustments for any skill areas based on sex. The following observations are worth noting, however:
 * Female characters cannot sell loot at the Outlaw Camp because H.L., the NPC there, refuses to speak to women. The reason for this is unknown.  It could be that H.L. thinks women are not suited for a life of medieval adventuring.  Some players speculate that H.L. is, in fact,.
 * Female characters are less likely to be targeted for player killing.
 * Many (perhaps most) female characters are male in real-life, whereas very few male characters are played by real-life females.

Changing sex
A premium account player can change the sex of a character, but there this results in a penalty of 5 days premium membership for every sex change performed. Because of this, when creating characters, it is advisable to choose a name and sex that are appropriately matched.

It is not uncommon for a hacker to change the sex of the hacked character to cause even further devastation to the true owner of that character.