Biological models of sex tend to view love as a mammalian force, much like hunger or thirst. Helen Fisher, a foremost expert in the topic of love, divides the knowledge of love into three partly-overlapping stages: lust, attraction, and accessory. Lust exposes people to others, romantic magnetism encourages people to focus their energy on mate, and accessory involves tolerating the spouse long sufficient to rear a child into infancy.
Lust is the initial passionate sexual desire that promote mating, and involves the increased release of chemicals such as testosterone and estrogen. These properties rarely last more than a few weeks or months. Attraction is the more individualized and romantic desire for a specific candidate for mating, which develops out of lust as commitment to an individual mate forms. Recent studies in neuroscience have indicate that as people fall in love, the brain consistently release a certain set of chemicals, counting pheromones, dopamine, norepinephrine, and serotonin, which act related to amphetamines, stimulating the brain's pleasure center and foremost to side-effects such as an augmented heart rate, loss of appetite and sleep, and an intense feeling of enthusiasm. Research has indicated that this stage usually lasts from one and a half to three years.
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