http://news.bbc.co.uk/1/hi/health/8498362.stm
A mechanism which starts sperm swimming when they get near the egg could one day lead to new forms of male contraception, scientists have said. Tiny pores on the sperm’s surface allow it to change its internal pH, which in turn starts its tail movements. Researchers from the University of California in San Francisco said the study might also explain why marijuana makes men infertile.
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