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怀孕
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性交
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怀孕仅在女性体内发生。由此，女性身体内部是精子与卵子不得不相遇的地方。精卵相遇通常是性交的结果。性交
(coitus，自拉丁语，照字面的意思——走到一起）定义为性交往的一种方式，既男性的阴茎被插入阴道。性交的另一个指称为交配（copulation）或阴道交接。
在性交过程中，男女性器官的密切接触能够给双方带来愉悦。当双方身体运动以增加相互的刺激时，这种愉悦会累积起来。最终，愉悦和兴奋达到颠峰。这种使身体放松和达到极妙满足的颠峰就叫性高潮，而且就男性来说，它就意味着从他的性器官向女性性器官的骤然射精。所射出的精液内含有精子。显然，男性的性器官在人类生殖中是非常重要的。只有在性高潮期，男性才能够经历其性器官内部的肌肉收缩，而肌肉收缩是射精所必须的。没有射精，精子仍存留在男性的体内。可是，也有规律之外的某些情形发生。在性高潮之前，男性要想射精是不可能的，甚至于有了性高潮，射精最终也未必发生。
当然，女性没有性高潮却能够怀孕。在此也应该指出，现代医学技术通过人工授精已经把精子和卵子放在了一起，既没有性交也做到了这一点。 |
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Conception
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Coitus
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A conception can occur only inside a woman's body. Here then is the place where sperm and egg have to meet. Their meeting is usually brought about as a result of coitus. This Latin term (literally, going together) refers to the kind of sexual intercourse in which the penis is inserted into the vagina. Other words for coitus are copulation or vaginal intercourse.
The intimate contact of the male and female sex organs during coitus can give both partners great pleasure. The pleasure mounts as their bodies move to increase the mutual stimulation. Eventually, pleasure and excitement reach a climax. This climax, which provides relief and deep satisfaction, is called orgasm, and for the man it means the sudden release of his semen from his sex organs into those of the woman. This semen contains the sperm cells. Obviously, the man's orgasm is very important for human reproduction. Only during orgasm can he experience the muscular contractions inside his sex organs that are needed to discharge the semen. This sudden discharge is called ejaculation. Without ejaculation the sperm cells remain inside the man's body. However, there are some exceptions to this rule. It is not impossible for a man to release some sperm in advance of his orgasm and even if the orgasm should eventually fail to occur.
A woman can, of course, very well become pregnant without having an orgasm. It should also be mentioned that modern medical techniques have made it possible to bring sperm and egg together by artificial insemination, i.e., without coitus. |
