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避孕 |
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避孕方法:男性避孕方法
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阴茎退离
阴茎退离法在拉丁语中称为性交中断（coitus interruptus）（最好改用，性交骤然终止，coitus abruptus；中国大陆之前译成“体外排精避孕法”——译者注
）。意思很简单，那就是当进行性交时，男方在射精前骤然把他的阴茎抽离阴道（这并不是性交中断，而是终止性交）。这样做的结果是，男方的精子不会射进女方的阴道并因此而避免受精。
虽然这在理论上看来令人信服，在实践中却并不总是灵验。许多男子掌握不好阴茎抽离的时机。性交中总是担惊受怕和需要控制性反应，这样总是让性伴双方相当地紧张。在实际射精之前有一些精子游离出阴茎也是有可能的。甚至于已经射在阴道之外的精子只要与湿润的体表接触，也能够自己游进阴道内。鉴于此，阴茎退离并不是可靠的避孕方法。事实上，这种方法仅有的优点是勿需事前作出准备和随时可用。可是，它的缺陷是如此之大，以至于大多数人会发现它只有在非同寻常的情形下才是合宜的，也就是只有当没有其它方法可用时，才不得已而为之。 |
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Contraception
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Methods
of Contraception:Contraceptive
Methods for Men
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Withdrawal
The withdrawal method, also known by its Latin name coitus interruptus (better:
coitus abruptus), is probably the oldest method of contraception. It simply means that, when having intercourse, the man suddenly withdraws his penis from the woman's vagina just before he ejaculates (this does not interrupt the coitus, but actually ends it). As a result, his sperm is not deposited inside the woman's body and therefore cannot fertilize the egg.
While this sounds convincing in theory, it does not always work in practice. Many men have difficulty finding the right moment for withdrawal. The resulting worry and the need to control sexual reactions at all times can create considerable tension between sexual partners. It is also possible that some sperm is released from the penis well in advance of the actual ejaculation. Furthermore, even sperm cells that have been ejaculated outside the vagina can move inside by themselves as long as they are in contact with a moist surface. For these reasons,
withdrawal is not a reliable method of contraception. Its only advantage is the fact that it needs no preparation and can be used anytime. However, its disadvantages are so serious that most people will find it appropriate only in unusual circumstances, when no other methods are available.
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