Keep an open heart. We are wired to find love.

Men tend to be hierarchical, but women are driven to make lateral connections so they can cooperate.

Games are the way we keep romance alive. They're based in human hardwiring. Playing hard-to-get or leaving a little to the imagination allows the woman to be wooed and appreciated and the man to be challenged and intrigued.

There are cognitive processes and limbic reactions associated with basic emotions. And you can change brain chemistry, but you're still not going to change memories and experiences in a human being.

Saliva has testosterone and estrogen. When you kiss, you're having a chemical experience.

People have been looking for love potions since hunter-gatherer societies.

Women apparently are quite drawn to men who have differences rather than similarities in their histocompatibility system. They pick it up by smell, and they can pick it up from kissing.