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情到深处如何避孕？单身狗不懂的科普你必须看
source link: http://tech.sina.com.cn/d/v/2017-11-21/doc-ifynwnty6281037.shtml
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来源：科普中国微信公众号最近，有很多网友给小编留言，如何科学避孕？今天小编就为大家科普一下！避孕套（Condoms）是以非药物的形式阻止受孕，主要用于在性交中阻止人类的精子和卵子结合，防止怀孕。现在的避孕套原料通常是用天然橡胶或聚亚安酯。很
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