How Love Changes Your Body Chemistry

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Testosterone takes off

Although testosterone is thought of as a macho hormone, it helps stoke the fire in both sexes.

“It is just one of the many pieces for romantic love,” says Fisher. “Sex can drive up your testosterone levels.”

Men naturally have higher testosterone levels and trace amounts in saliva. One theory says that when people lock lips, the transfer of this hormone could increase sexual desire in a partner.

Next: Tongue tied?

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