An on-demand, non-hormonal male contraceptive pill may be a real possibility say scientists who have found a cell pathway, or switch, that stops sperm from being able to swim. Tests in mice suggest it keeps sperm stunned for at least a few hours - long enough to stop them reaching the egg.
Many more tests are planned and needed, moving to rabbits before people.
The idea is users could pop a pill an hour before sex and keep an eye on the clock for when it wears off.
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