I'm another girl who plays eroge, so I can't really say much about guys opinions....but I can mention what I'm in it for.
I'm into it for the story (of course, that's what everyone says about anything close to porn, so....^^;; ) and I just find some of the concepts interesting. Yes, I get looked at weird, but who cares -- if I get to experience stories such as Katawa Shoujo's inspiring tales, who cares! So long as it's not a more 'heartless' game such as Idols Galore or Virgin Roster where the 'hero' is definitely too cruel for my taste, I'll have my fun with it. ^_^
Oh, and before anyone says I should play otome games....no DS emulator really wants to cooperate with me on the Tokemeki Memorial games (I'd prefer the girls anyway -- is 2 translated? Those look really really cute ;w; ) and Yo-Jim-Bo just doesn't catch my interest -- all of the characters seem sort of....dull, anyway, so :/ IF there are any better ones, though I'd like to know ^^