Since I'm from the PlayStation3 Version, I know what it's like.
CO-OP is spitscreen. P1 = Boy, P2 = Girl.
CO-OP ONLINE is: HOST = Boy, JOINER = Girl.
Remember teh ies need headshotz!
[Edited by MasterLegend, 3/20/2009 6:45:55 PM]
However if the host has already beaten the game, then they can choose to play as Sheva.