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If you're looking to make an impression on your valentine, flowers and chocolate can certainly go a long way, though maybe that's a little predictable. What about certain foods that are said to stir up passion? I'm thinking of oysters.

NPR's Allison Aubrey has this report on the links between oysters and love.

ALLISON AUBREY, BYLINE: Oysters are big in the restaurant scene, just ask fishmonger MJ Gimbar. He'll be serving up hundreds tonight at Black's Restaurant in D.C.

MJ GIMBAR: All right, so we've got four different species of oysters. The first oyster you're going to look at is the kumamoto.

AUBREY: As he wiggles his knife in and pops open the shell, he says this oyster is one of his favorites. It's small and sweet. It tastes almost like melon.

GIMBAR: Oh yeah, it's really good. I love it. The texture is kind of like a creamy, velvety - it's basically like a kiss from the ocean.

AUBREY: A kiss from the ocean, MJ says lots of diners who order oysters don't think of it as just a dish. They're after something more.

GIMBAR: There is something primal about eating an oyster. It's kind of exotic. It's almost like a sexual experience.

AUBREY: Now, MJ is certainly not the first oyster lover to make this association. Culinary historian Kathleen Wall of the Plymouth Plantation in Massachusetts says when it comes to oysters and other shellfish, the romantic goes back at least to the Greeks.

KATHLEEN WALL: The very origins of origins of oysters and shellfish are from Aphrodite and Eros, the Greek god and goddess of the sea rise up on shells - on the half shell, as it were. And so there's that classical connection.

AUBREY: Back then, people thought just being near oysters could help kindle desire. So the Greeks thought of oysters as a kind of fertility treatment. It sounds crazy, but to this day, scientists are still trying to see if there's something there. They've looked at the zinc in oysters, which is linked to increased testosterone and most recently have focused on the amino acids found in oysters. One researcher in Naples, Italy, Antimo D'Aniello who I spoke to by Skype, told me he's convinced that there's a scientific basis for an aphrodisiac effect.

ANTIMO D'ANIELLO: Yes, yes, it is right.

AUBREY: He points to a study that found high levels of one particular amino acid found in oysters improved the sperm count of rabbits.

D'ANIELLO: Yes, I was surprised, but I expected it.

AUBREY: Now the extent to which this could be true in humans begs a lot more investigation. Perhaps the amino acids are significant, but if this is the case, similar amino acids are found not just in oysters, but in all kinds of foods, from fish and seaweed to avocados and eggs. Are they all aphrodisiacs? Now, historian Kathleen Wall is skeptical. She says maybe scientists have not been focused on the right thing.

WALL: The part they're not identifying is perception. What people think about food makes that food have an effect on the body. It's the placebo effect.

AUBREY: She says look at how the narratives connecting love and oysters have amplified over the centuries. Take, for instance, 17th century Dutch paintings. Scattered oyster shells are a common symbol of lust and in colonial days, women who sold oysters, known as oyster wenches, were thought to be inviting something more than a simple transaction.

WALL: Oyster wenches were noted to be perhaps a little easy because they were so stirred up by their mere proximity of oysters.

AUBREY: Wow. What a reputation. Wall says whether it's love or lust, oysters carry their past with them.

WALL: Now, we haven't let go of that and that makes it more powerful.

AUBREY: So if our belief systems are key to evoking an aphrodisiac effect, consider this, it has not always been the oyster in the romantic spotlight. At one point in history, an influential health expert recommended the turnip for its strong aphrodisiac powers.

WALL: Turnips, yeah, turnips just was like, oh, my goodness, turnips are the Viagra of the 17th century.

AUBREY: So if oysters aren't in your Valentine's Day budget, well, there's one affordable alternative. Allison Aubrey, NPR News.

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