Brains in love and brains in lust are not identical. Erotic photos activate the hypothalamus (which controls hunger and thirst) and the amygdala (arousal) areas of the brain. Love activates areas of the brain with a high concentration of receptors for dopamine (associated with euphoria, craving, and addiction) and its relative, norepinephrine.
Many cultures use knots as symbols of an eternal love that has neither a beginning nor an end. Young Muslim women would send love messages to their lovers using intricate knots.
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