Based on an item in The Times. Scientists sugggest that more daylight leads to lower quality semen.
Men produce more malformed sperm and have a lower sperm count in summertime.
Both light and heat seem to be factors in causing this, according to American research published in 'Fertility and Sterility' journal. You can give a rating to this scheme overall. Click 0-10 below and press the Submit button. DoBe.org or click on the image below.