05:32DiscoveryThe Life Scientific: Chris BarrattBBC World Service Duration: 27 minutes Tue 24th Oct 2023, 05:32 on BBC World Service South AsiaAvailable for over a yearListen nowChris Barratt on head-banging sperm and a future male contraceptive pill. Show more GenresFactualScience & NatureFormatsMagazines & ReviewsBrandDiscovery Source: BBC Online