[Luvian]

Female drow favored class is priest, male is sorcerer. If you read the Drizzt novel, you would know that female always end up priest, while the most powerful male become mage or sorcerers.

The favored class is a cultural thing. Most dwarf are fighters, most halfling are thief,... they are more comfortable in that class, that's why it does not confuse them to have it. But an halfling Monk/wizard might be a little confused with the mix, hence the xp penalty. Human and half elves are more versatile, that's why they don't have a fixed favored class.