One: Seduction is under bluff, generally.<br/><br/>Two:  Sadly no.<br/><br/>Three:  Background skills count as Class skills no matter which class you choose.<br/><br/>Four:  Given the amount of travelling that the average adventurer does, they're bound to pick up tongues from distant lands.  Also, as is suggested, I will fiat you some free languages (As in having spent a few weeks there gets the character some familiarity.)