The Charismatic hero gets a bonus on all Charisma-based skill checks made to influence members of his chosen gender. (Some characters are charming to members of the opposite gender, others to members of the same gender.) The bonus is equal to half the character's charisma modifier, minimum 1.
A Charismatic hero can only charm NPC characters with attitudes of indifferent or better. The charm bonus can’t be used against characters who are unfriendly or hostile.
This ability can be taken more than once (for another gender) for half the AXP.