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精子不死
古代曾有“一滴精、十滴血”说法，言情小说亦曾描绘纵情女色之流，最后不乏“精尽人亡”。
从现代医学的角度来看，这些描绘多少都会渲染过当，因为男性从青春期开始，睾丸每天都会不停地制造精子，数量无限，直至年老。
不过，随着年龄及身体状况的改变，男性制造精子的速度也会受到影响，因此，当精子的制造速度赶不及频繁的性生活时，恐怕就会碰上无精可射的现象。 一名女子与男友同居多年，性生活欢愉，男友每次都很快射精；但后来有两次他们在晚上做爱后，隔天早晨再来一次，结果男友竟然射不出精来，让她担心这种情形会影响到他们婚后生育。
泌尿科医师表示，正常成熟的男性每次射精量约在３㏄到８㏄间，每㏄的精虫数约６千万只到９千万只。
男性制造精子的速度，固然是随年纪等因素递减，但中壮年者性爱过度频繁，不见得每个人射精后，都能在短时间内恢复射精。
女性制造的卵子，一生中有一定的数量，“用完了”就没有了。
但男性睾丸则具有不断新增精子的功能，因此，坊间所谓“精尽”的说法不尽正确。
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