Male contraception: Cutting of sperm"s power supply could make a man temporarily infertile

Off with their tails! Male contraceptive pill a step closer as scientists cut off the power supply that helps sperm swim Gene mutation disrupted their ability to swimResulted in sperm tails that were 17 per cent shorter and a 50 per cent reduction in sperm production | UPDATED: 12:05 GMT, 9 October 2012 Scientists have found a way to stop sperm swimming, making the long-awaited male contraceptive pill a step closer to fruition.