Steve Den Beste's comment about the otaku's dream girl hits hard in many, many ways...
Mostly because he's described one of the problems of any otaku-getting women interested in him in a good way. Most otaku girls/women tend to have issues...and they tend to be interested in men that most otaku males are not.
Case in point, YaoiCon was held last weekend and the hotel was near San Francisco Japantown. The restaurant there I like to eat at when I can (sadly, not daily-long story) had a horde of fangirls. Most likely they were very young-high school to early college-due to the high amounts of giggles over sexual pairings and triplets and other odd combinations. The only series they talked about? Naruto. The proposed relationships? Let's just say that anybody that has had any idle fantasies of Harry Potter/Draco Malfoy slashfic would find the love geometry disturbing...
So, for the fan that isn't highly bishionen...you can see the issue. Or that don't have on their Character Sheet "Dark Flaw:Secretly Not Gay".
Also, the Otaku Dream Girl is interested in the main character because they like him. Not what they can do for them-get them beer, solve their problems, be their last-choice date because the guy they wanted to take out dumped them at the last minute. They realize that the character's heart is good, even if his efforts are at best bumbling...or naive. Or, better yet, they know the character is worthy...and is worth knowing better.
The main character knows where they stand with the Otaku Dream Girl. It's not a game of "emotional minesweeper", or the ever-popular "does this outfit make me look fat?" passive-aggressive BS that some women think is their due. Or wondering if the girl is hanging out with them because the main character can fix their computer/do magic/has wished for a girl like her to stay with him forever.
Sadly, that's why the Otaku Dream Girl is a fantasy-the attractive girls want to have Johnny Depp, or Orlando Bloom, or whatever androgynous male boy-toy that looks good in boxers is this year. That is "kind" and "sensitive" and can know their emotions. Oh, and dress well, too. The ugly girls want something that tends to validate that they are fucked up, and not worthwhile. And the guys? We're confused here.