Valentine's Day Facts: History, And Love Science

Where did Valentine's Day come from? (Think naked Romans, paganism, and whips.) why do we fall for it, year after year? Read on.

Valentine's Day History: Roman Roots

More than a Hallmark holiday, Valentine's Day, like Halloween, is rooted in pagan partying.

The lovers' holiday traces its roots to raucous annual Roman festivals where men stripped naked, grabbed goat- or dog-skin whips, and spanked young maidens in hopes of increasing their fertility, said classics professor Noel Lenski of the University of Colorado at Boulder.

The annual pagan celebration, called Lupercalia, was held every year on February 15 and remained wildly popular well into the fifth century A.D.—at least 150 years after Constantine made Christianity the official religion of the Roman Empire.

"It is clearly a very popular thing, even in an environment where the Christians are trying to close it down," Lenski said. "So there's reason to think that the Christians might instead have said, OK, we'll just call this a Christian festival."

The church pegged the festival to the legend of St. Valentine.

According to the story, in the third century A.D. Roman Emperor Claudius II, seeking to bolster his army, forbade young men to marry. Valentine, it is said, flouted the ban, performing marriages in secret.

For his defiance, Valentine was executed in A.D. 270—on February 14, the story goes.

While it's not known whether the legend is true, Lenski said, "it may be a convenient explanation for a Christian version of what happened at Lupercalia."

What Is Love? Evolution and Infatuation

Valentine's Day is all about love. But what, exactly, is that?

Helen Fisher is an anthropologist at Rutgers University in New Jersey and author of several books on love, including Why We Love: The Nature and Chemistry of Romantic Love.

Fisher breaks love into three distinct brain systems that enable mating and reproduction:

• Sex drive

• Romantic love (obsession, passion, infatuation)

• Attachment (calmness and security with a long-term partner)

These are brain systems, not phases, Fisher emphasized, and all three play a role in love. They can operate independently, but people crave all three for an ideal relationship.

"I think the sex drive evolved to get you out there looking for a range of partners," she said.

"I think romantic love evolved to enable you to focus your mating energy on just one at a time, and attachment evolved to tolerate that person at least long enough to raise a child together as a team."

Valentine's Day, Fisher added, used to encompass only two of these three brain systems: sex drive and romantic love.

But "once you start giving the dog a valentine, you are talking about a real expression of attachment as well as romantic love."