What attracts hero to heroine and heroine to hero?

We've all read books that have a little attraction between a guy and a girl or a man and a woman. Heck, even some of the hard core mysteries have a little romance in them, right? They do if real life seeps into the story.

I thought a fun discussion topic would be what attracts a hero to a heroine and what attracts the heroine to the hero.

Is it that the guy can actually match his clothes when he gets dressed in the morning all by himself or that he washed his morning whiskers down the sink?

Is it that the woman doesn't cake her makeup on so she reminds him of his grandmother or that when he asks her what she would like for a dinner out she actually answers him and says chicken wings?

Let's see what everyone has to say. Share your ideas/thoughts in the categories below. Share what you believe or what you've read or written about in books.

Hero to Heroine: (What attracts hero to heroine?)

The way the heroine carries herself when she walks into a room (like she knows what she is doing)
An independent woman who does not rely on the man
Someone who is fun and outgoing
A woman who is not afraid to challenge him
The way her hips sway when she walks
Her smile
Her laugh
Her intelligence and that she's not afraid to show it

Heroine to Hero: (What attracts heroine to hero?)

A guy with a sense of humor
Nice butt in a pair of jeans
His intellect
His crooked grin
That the hero is not an easy catch
The deep sound of his voice