Two-weapon penalties

[Carvel]

ok... new guy here. got a little situation here.

what I am about to ask is something that i think most of you will think it's stupid, as I thought before.
but that started a discussion in my game table that could go on for hours.

The penalties for two-weapon fighting with a light weapon in off-hand would stick for the second attacks or not?
*I can almost hear the "HUNH?!" faces across the forum*

elaborating:
the att bonus progression, until level 20 would be, with the improved and greater feats:

a) +18/+18/+13/+13/+8/+8/+3

or

b) +18/+18/+15/+15/+10/+10/+5

I know there are talents to maximize this(A LOT!!!!), but that is not the point here. it's just that I thought it was option a) for little less than 8 years now(started playing D&D when 3.5 came out) and now that I decide to give a try to it (I'm more the big two handed weapon wielder or spellcaster kinda guy), and the other players in the table went on saying I was wrong.

Dunno... though this way I get more att bonus, feels kinda wrong, I guess.

[Tyger]

Yes, the -2 / -2 to your attacks (assuming of course you have a light weapon in the offhand and have the TWF feat) apply to every attack in the attack chain, from the first, to the very last.