When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
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Women rate men more attractive if other women are looking and smiling at him.
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Holding hands with someone you love can alleviate physical pain as well as stress and fear.
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Wearing red increases attraction.
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One in five long-term love relationships began with one or both partners being involved with others.
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Men fall in love faster than women do.
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Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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