Is homosexuality determined by serotonin?

The brain chemical serotonin is known to be connected to sexual drive and behavior, and a new study suggests that it also may be linked to homosexuality. The research conducted at Peking University and the National Institute of Biological Sciences in Beijing have found that altering serotonin in the brains of mice dictated their sexual preferences, according to LiveScience.

The results of the study were published in the journal Nature on March 24. The scientists involved with the study used two methods to alter the brains of male mice, making them unable to produce serotonin. The chemical regulates sexual behaviors including erections, orgasms and ejaculation in mice and men.

The altered male mice showed a remarkable indifference to females, and were willing to woo and mount males, something that normal mice don't do. According to the news source, the mice emitted "ultrasonic love songs" to the sexually responsive males, which they typically do before attempting to impregnate a female.

The researchers caution against making conclusions based on this study. They say more research is needed to prove that there is a link between serotonin and sexual preference.

Gay men who regularly engage in sex should be sure to use condoms, as they are one of the best ways to prevent the spread of sexually transmitted infections.

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