The majority of today's female. Especially married females.
I'm a 25 year old virgin. If I ever have the pleasure of finding someone I'll marry (and who'll marry me back) we're having sex at least every two days for *decades*. This is my decision.
As for what's important, I agree with a lot of what's been said before:
(please understand that the "you"s in the next few sentences are hypothetical you's)
Honesty is a must, and if you lie about the little things I'm going to assume you lie about the bigger things. It's ok to have your own opinions or disappoint me with your behavior. I'll get over that. I don't get over deception.
Showing consistent personal growth. This is a big big one. It's not enough that you believe right and wrong or have passions, if you're not improving as a person you can forget it.
Intelligence (this is because I cannot see myself holding daily conversations with someone who I have to explain my vocabulary to)
I have to be comfortable with you.
Good hygiene. Also a big deal. Leave you socks in the floor, whatever, but don't smell funky, try not to wear a shirt covered in ketchup stains, and work-out every once in a while.