I don't think there'd be less porn...just different KINDS.
Women are more likely to access erotic literature than video porn, but don't be fooled into thinking that women don't use the internet for porn
Also, I'm not sure how much it would change things. I don't want to talk stereotypes (I'm not a typical woman in the slightest, and I'm sure there are other women like me on the net), so won't, but I think there'd be less trolling, less abuse on Xbox Live and the PS3 Network...maybe I'm wrong, but I get the impression that, although women play games with the same calibre of skill and dedication as men, maybe it's less "I have to prove myself as a big man if someone screws me over in a game" and more..."One day, I will meet him, make him fall in love with me, then do eeeeeeevil things!!! MWAHAHAHAHAHAHA".
Seriously though...I don't think it would change a hell of a lot.
EDIT: Actually, maybe there wouldn't be fewer trolls. I regularly troll Cher Lloyd's (X-Factor) Facebook page, purely because it's so goddamn fun!
EDIT: Also, I'm not liking the amount of sexism on this thread.
I don't give a crap what your personal views are, but keep them to yourselves, please. Don't base your answer on stereotypes. It's highly offensive.