"Exposure to bright light can raise testosterone levels and lead to greater sexual satisfaction in men with low sexual desire according to the results of a small scientific trial.  Scientists at the University of Siena in Italy found that regular earlymorning use of a light box  similar to those used to combat Seasonal Affective Disorder or SAD  helped men increase testosterone and improved their sex lives.  Andrea Fagiolini a professor who led the study and presented it at the European College of Neuropsychopharmacology conference in Vienna on Monday said the treatment may prove useful during the Northern hemispheres darker winter months.  The increased levels of testosterone explain the greater reported sexual satisfaction he said. In the Northern hemisphere the bodys testosterone production naturally declines from November through April and then rises steadily through the spring and summer with a peak in October.  Low sexual desire can affect significant numbers of men after the age of  with studies finding that up to  percent of men report problems.  Fagiolinis team recruited  men diagnosed with either hypoactive sexual desire disorder or sexual arousal disorder  both characterized by a lack of interest in sex.  After taking baseline readings they divided the men into two groups and gave one regular treatment with a bright light box while the control or placebo group was treated with a light box adapted to give out significantly less light.  We found fairly significant differences Fagiolini said.  Before treatment both groups averaged a sexual satisfaction score of around  out of . But after treatment the group exposed to the bright light was scoring sexual satisfaction scores of around .. In contrast the control group only showed an average score of around . after treatment.  Editing by Alexander Smith Our StandardsThe Thomson Reuters Trust Principles. httpthomsonreuters.comenaboutustrustprinciples.html"