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The rise of sexuality lies in the genes

June 2 2006
10:17

Scientists studied a gene known as the dopamine receptor D4 (DRD4), which partly controls the brain's response to dopamine - a substance, which are usually associate with "the system treats" in the body. Scientists know that this neurotransmitter can control sexual behavior in animals and humans and that the circulation of dopamine contributes to the need for such things as sex, drugs and foods.

Richard Ebstein of Hebrew University in Jerusalem to explore the idea of the gene DRD4 occurred after a study in rats. They found that a drug that blocks the function of this gene helps control the erection of these rodents.

The researchers asked 148 students of both sexes: "How important is sex in your life? " and "How often do you have sexual fantasies?". After analyzing the responses, the researchers found that the exponents of sexual desire in students with a specific version of a gene on average 5% lower than students with an alternative version. This is a small but statistically significant difference. Approximately 70% of the population are carriers of the gene of low sexual excitability and about 20% - high, according to the website www.nature.com

Scientists do not know exactly how these genetic differences can affect libido, because dopamine has many functions that affect our behavior. Some signs indicate that the gene DRD4 is associated with the search for novelty, so it is more sexy people might simply fall into the category of people who generally need more vivid impressions. Dopamine may also affect just how strongly the brain reacts to sexually exciting stimuli and how sharply it is the reaction of the body, in particular an erection.

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