Have completely absurd standards
When choosing a beau, don't settle for things like "trust," "mutual respect," and "being actually interested in each other's personality." Instead, aim for the stars - big, soulful eyes; perfectly manicured stubble; and, hopefully, a huge lie on which your entire relationship will be based. Acceptable lies include: it was a bet, I was doing a story on you, I was getting paid, I take on a make-believe character in order to sleep with random women, I'm really the prince of Zamunda, I've been sabotaging your job by stealing your ideas, or I'm actually a man dressed as an old woman. You may get a public declaration of love out of it, so random strangers can clap when you kiss and make up!
Only take your job seriously if it's not taken seriously by anyone else
You can be a magazine editor, an advertising exec, a publisher of some sort, the owner of a flower shop, or something that is completely made up. In all of those cases, taking your job seriously is cute. If, however, you are an attorney, a "businesswoman," or a doctor, taking your job seriously is the exact reason you're still single, and the only obstacle to getting your man. Find some way to let your beau undermine you at your job, run out on an important meeting, or at least start wearing dewy makeup and flowy skirts to work. This signifies that you are letting love liberate you from the evil shackles of workplace success.
Dress in a non-threatening way
My favorite example of this is Sandra Bullock in While You Were Sleeping. They seemed absolutely determined to dress her as an 1840s London street urchin. Her sweaters were so oversized that she could literally hide a present in her sleeve. She could not be less sexual (read: troublesome) if she tried, though it kinda seems like she tried at least a little.
|This is her most svelte outfit in the entire movie. Seriously.|
Have exactly one hobby, interest, or definable personality trait
In Runaway Bride, one of Julia Roberts's personality traits is that she doesn't have any personality traits. We learn this from the fact that she orders her eggs the same way as her current boyfriend does. Her final breakthrough comes when she tastes every style of egg and decides on the one she likes. I'm not making any of this up.
If you have a friend, she better make you look good by comparison
Having multiple lady friends is for lesbians, divorcées, and spinsters. Pick your one friend, and make sure there is one hilarious thing wrong with her. Maybe she's way too opinionated. Maybe she enjoys having and talking about sex. Maybe she has a Southern accent. Combine that with her less attractive face, and you have a recipe for success. When your beau sees the two of you together, he'll certainly realize that, while there are other fish in the sea, they are all completely unacceptable to him.
|Presented without comment.|
Above all, be nice
Seriously, if you say literally anything that's negative, you don't deserve to be a romantic comedy heroine.