6. But they shoot for "special sex" anyway.

You have special "anniversary sex" on your anniversary, sure. But if you also orchestrate sexy adventures a few other times a year, you're doing your marriage a huge favor.

"Happy couples sometimes pull out all the romantic stops," says Berman. Not because romantic sex is more bonding, but because the act of making the effort -- whether it's booking a Bed &Breakfast or wearing a pretty new nightie rather than your threadbare PJs -- sends a crucial message to your guy that you still care, says Berman.

And variety is the spice of a good sex life. "The latest research has found that one of the keys to sexual satisfaction is a sense of sexual adventurousness," says Berman.

Plan a romantic adventure and the thrill of the new will give you both a rush -- a hormone rush, that is.

"Sleeping on new sheets (at home or in a hotel), trying a new position or anything new will actually inspire the same dopamine response in your brain that made you feel addicted to each other early in the relationship," says Berman.

If you want to kick his lust hormones into high gear, plan a mystery date, a favorite move of Amy, 30, a newlywed in Santa Barbara, California. "When I feel a night of romance is in order, I create a sexy email address from a free account, like Hotmail. To make the name recognizable (so he doesn't delete it), the name always includes our lucky number, 23," she says. "I don't write anything in the email except an address and time. When he shows up at the restaurant, I'm waiting alone at the bar. Then I take him to another restaurant, just to keep him guessing. He says it drives him wild."

7. They do the ultimate intimate move.

Four words: Eye contact during orgasm.

"It's such a vulnerable moment that sharing it adds a huge degree of intimacy to your relationship," says Berman, who notes that a lot of long-term couples can't master this seemingly simple bedroom move.

Locking eyes during lovemaking can also make you feel -- and act -- sexier, says Christine, 31, who lives in Middletown, New Jersey. "I feel more attractive when my husband is looking at me during sex," she says. "And that makes me more relaxed and open in bed."

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