He found that men who had ejaculated more than five times a week in their 20s were a third less likely to develop aggressive prostate cancer later in life .
Those who ejaculated more than five times a week were a third less likely to develop serious prostate cancer in later life .
The technology-laced Nasdaq Composite Index was up 7.60 points , or 0.46 percent , at 1,653.62 .