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I thought some of you may be interested in a study that was reported in the Economist. It said that the quality and quantity of sperm produced in many animals is improved when these animals are in competition with other males. Scientists in Western Australia* tried to reproduce this effect in human males and were succesful in increasing sperm motility in the subjects. The effect occured in males who had been shown a pornographic image where two men were with one woman. (it didn't occur when the image was of three women). So get those porn mags out! They also noted that carrying a mobile phone close to the testes (eg. in trouser pockets or coat pockets that hang in that area) had a negative impact on sperm numbers and motility.
*The study was originally published in Biology Letters by Sarah Kilgallon and Leigh Simmons at the University of Western Australia and appears in The Economist June11th-17th 2005 p 83.
*The study was originally published in Biology Letters by Sarah Kilgallon and Leigh Simmons at the University of Western Australia and appears in The Economist June11th-17th 2005 p 83.