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Older men are also more likely to pass genetic mutations onto their children, about , according to an Icelandic study.A 2017 study of 1.4 million people in Sweden found a consistent linear relationship between a man’s age and the likelihood that his children would be born with a genetic mutation that neither parent has.Miller and Byers found that men reported a much longer ideal duration than did their partners.It's true that for both sexes, the “ideal” length of both foreplay and intercourse was much longer than the actual.Ejaculated sperm that land on cold, dry objects may die after a few minutes — although very rarely they may last a whole 30 minutes.They may die even faster in a hot bath or a hot tub due to the heat or chemicals in the water. Sperm production, or spermatogenesis, does take place indefinitely, but the quality and motility of sperm declines with age.

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But underwear has (almost) no effect on your sperm.Fortunately, as the human body has evolved over thousands of years to maximize fertility potential, so has our scientific understanding about sperm.