Dating Quiz: What's Your Courting IQ?

Say "cheese!" Both men and women judge possible dates on their teeth, according to a Match.com study. If they have a good smile, that's more important than a lot of things. But speak properly, because grammar is also important. It ranks as a close second and just ahead of a great head of hair.

Of course, every situation is different, and people sometimes don’t tell the truth. But an Esquire study found most men say they wait 3 dates, and women say they wait 5.

It may sound old-fashioned, but in a study of more than 17,000 people, 84% of guys said they pick up the tab most of the time. More than half of women say they offer to pay, but many hope the men would say no. Dating experts say it's still expected that men will ask for the date, then pay for it.  

As far as etiquette goes, the one who does the asking should do they paying, Lizzie Post of the Emily Post Institute says. Stay smooth by working out who pays ahead of time rather than waiting for the bill to arrive.

Don't discount the Internet when it comes to dating. Couples who meet online tend to be more educated and more likely to be employed, a recent study found. Online couples also have a lower divorce and breakup rate than couples who meet the old-fashioned, in-person way. 

But be careful. More than half of online daters say others have fibbed about themselves in their profiles.

Hooking up with a friend isn't always a one night stand. About half of single people say they've slept with a friend. But a Match.com survey of more than 6,000 people found that about 44% of those arrangements turn into long-term relationships. What we don’t know is whether those are just lasting hookups or more committed relationships.

Several studies found that men are quicker to feel they're in love than women. One survey found that most men know if it's love after just 1 date, the rest know within 3. Women, on the other hand, wait at least a month before making up their minds. Men, too, are usually the first to say "I love you."

More than half of single women check out someone on Facebook before a first date, according to the Match.com study. But only about a third of men do.

Your digital profile can hurt your dating chances. Half of women -- and a fourth of men -- say they'd cancel a first date because of something they found online.

Sharing religious beliefs makes it 50% more likely you'll be attracted to someone. It matters more than ethnicity and voting preferences.

If you love The Bacheloror The Bachelorette,beware. Those who watch romantically themed TV are more likely to be restless lovers. They're more inclined to think they've got better options out there. That's according to a study of almost 400 married couples.