Kissing is all about the chemistry

Despite the classic lyrics of the song from the movie "Casablanca," scientist Sheril Kirshenbaum says there is a lot of science behind the popular act of kissing.

"There's a chemical basis for what happens when our bodies meet at the lips," Kirshenbaum said.

She began exploring the subject in depth, she said, after writing a scientific article on the subject in conjunction with Valentine's Day. From there, the interest of other scientists blossomed and she decided there was enough interest for her to write a book on the subject, which resulted in "The Science of Kissing."

"There really is a chemical basis for falling in love," Kirshenbaum said . "I don't think trying to understand it takes any of the romance out of the equation."

Kirshenbaum explained her theory Thursday during the IdeaFestival, a four-day event designed to promote innovation and creative thinking.

Daniel Erb came to the festival from Lexington and was intrigued by the subject of the science of kissing.

"It's fascinating," Erb said of Kirshenbaum's ideas. "It's a human behavior you see everywhere."

Knowing some of the chemical and hormonal reasons for kissing doesn't spoil the mystery, Erb said. "It's still fun."

In her research, Kirshenbaum found literature that explores the differences between how men and women approach kissing. She pointed out that women report that a kiss is an important gauge of compatibility for them, while men often view kissing as a "means to an end."

Scientifically, Kirshenbaum said that may be connected to the limits of female reproduction, which biologically makes women want to find better mates because they cannot have an unlimited number of children.

Often, she said, a kiss can provide a window into long-term compatibility. "A first kiss is nature's ultimate litmus test," she said.

Mindy Russo, who came from Connecticut for the festival, said she was intrigued by the idea that hormonal reactions may play a part in the longevity of a relationship, rather than simply personality compatibility.

"It didn't occur to me that that could be hormonal," Russo said. "Our bodies themselves have so much to do with our lives."