What to expect after dating for 3 years

One-twentieth of a lifetime if we both live to be 200, which we plan to.

Starting with…Your sex life Wild nookie in a party coat closet? But familiarity can be pretty erotic, they told us—and, hey, nothing wrong with knowing what works!

"I think you get more adventurous when you're married.

Back before couples lived together pre-wedding, saying "I do" meant starting a totally different existence—new last name, new address, new (or any! "It was instant," says Chip Walker, a 28-year-old pharmacist in New York City.

Even in this era of been-there-done-all-that, marriage changes things.

For around 30 years, researchers have studied how having children affects a marriage, and the results are conclusive: the relationship between spouses suffers once kids come along.