Why He's Not That Into You

2. The Blahs
If you lack enthusiasm or don't have an opinion about anything, it's time for a new, exciting game plan. "She said her iPod is always on the 'repeat' setting. She listens to the same song over and over -- boring! My parents are kind of like that. They have their routines; they only like what's familiar. I want more variety and adventure in my life," says one of the men polled by Greenwald.

"The Blah girl comes along about once a single-life year," says Adam Muggenthaler, a 27-year old film producer.

"She can be fun the night you meet her, but once you get past the 'what do you dos' and 'where are you froms,' she starts telling the same stories and agrees with everything you say in every conversation. These girls have no substance or opinions, which cancel them out in my book."

Further, if you have lots of guy friends, none of whom lust after you, Greenwald's diagnosis is a secondary disability, the "sensual blahs."

Waylon Lewis, editor-in-chief of ElephantJournal.com and a renowned ladies' man, says he's witnessed the sensual blahs firsthand. "She's wasn't a boring person, but our conversation wasn't very stimulating," he says. "I didn't see her in a romantic way."

3. The Bait and Switcher
As a professional dating coach, Greenwald's a proponent of online dating. It's fun, entertaining and requires minimal effort -- unless you spend hours Photoshopping your profile picture so you look like a distant, much hotter cousin of yours. "The Bait & Switcher" isn't who she says she is.

"For the few weeks I did online dating, there was a girl that had a great photo and a bubbly personality, but when we met for coffee, it seemed like she used a very flattering photo from a long, long time ago. And it was obvious that someone had coached her or helped write her profile" says Ross Barasch, a 26-year old entrepreneur.

If that doesn't sound like a deal-breaker to you, imagine ordering a pair of shiny red stilettos online only to discover they've arrived out of the box with some scuffs and scratches. Get it? It's OK to sell yourself, Greenwald says, just "don't oversell and temper the shock if you have a specifi c prominent issue."