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This recent studies reveal that it is basically a rush of dopamine and serotonin that directs a trigger to the brain causing the sensation of feeling in love and with that also comes sexual desire. Love can be driven by the sex hormones testosterone and estrogen. Although testosterone is not confined only to men, it plays a major role in the sex drive of women. When people fall in love they can not think about anything else but their love. They might even lose their appetite and need less sleep, preferring to spend hours at a time daydreaming about their new lover.

In the attraction stage, a group of neuron-transmitters called “monoamines” play an important role: Dopamine – also activated by cocaine and nicotine- produces a sense of happiness and excitement; Norepinephrine – otherwise known as adrenaline- it makes us sweat and gets the hearth racing; and Serotonin- one of love’s most important chemicals and one that may actually makes us feel out of control.

One of the first hormones involved is dopamine, which has been commonly associated with the pleasure system of the brain, providing feelings of enjoyment and reinforcement to motivate a person to perform certain activities. It is also a love hormone that is an important part of the biological drive to choose a mate, because love as a fact is a primitive drive like hunger and the biology of love helps account for how people focus on one particular person. This view of love is based on observations of passionate behavior across cultures and most recently findings by scientists studying the human brain. In this same line Helen Fisher did some research using magnetic resonance imaging (MRI) machines to peer into the brain of colleges students in the early stages of love, and obtained the first direct evidence that the mechanisms of love activates particular areas of the brain with a high concentration of dopamine and this hormone is closely tied to states of euphoria, craving an addiction. At the same time dopamine in this stage is associated with another agent norepinephrine, and these two hormones can have effects like heightened attention and short term memory, hyperactivity and sleeplessness. When people are first in love, couples show the signs of surging dopamine and norepinephrine; increased energy, less need for sleep or food, focused attention in the smallest details of the novel relationship.