德国公司研发了一个输精管开关，可让精液逆流，达到避孕的目的
https://www.reddit.com/r/China_irl/comments/1kmu5nt/%E5%BE%B7%E5%9B%BD%E5%85%AC%E5%8F%B8%E7%A0%94%E5%8F%91%E4%BA%86%E4%B8%80%E4%B8%AA%E8%BE%93%E7%B2%BE%E7%AE%A1%E5%BC%80%E5%85%B3%E5%8F%AF%E8%AE%A9%E7%B2%BE%E6%B6%B2%E9%80%86%E6%B5%81%E8%BE%BE%E5%88%B0%E9%81%BF%E5%AD%95%E7%9A%84%E7%9B%AE%E7%9A%84/
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