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妊娠
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孕妇
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妊娠期性行为
妊娠期间，一些孕妇喜欢有更多的性行为，而其他孕妇愿意减少性行为。一般而言，许多孕妇在妊娠的第4-6月期间性欲似乎有增强；而在妊娠的最后3个月性欲减弱得非常明显。
在妊娠的任何时期，孕妇是否应该有性行为当然极大地有赖于其自身的感受。从纯医学的观点看，除了医生明确地劝阻的情形以外，在任何时候都没有理由为什么不应该有性行为。
只有在下列情形之下，医生才会劝阻妊娠期间的性行为：
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1.如果性行为导致阴道或腹部疼痛；
2.如果子宫有任何的出血现象；
3.当羊膜已经破裂时(详情请见“分娩”)；
4.在性高潮的时候，如果由于子宫的收缩有流产或早产的危险时。(在后一种例子里，与达到性高潮没有多大的区别。换句话说，也必须避免手淫。)
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有人也提出，在妊娠期间向阴道内吹气可能导致胎儿和孕妇的严重伤害。鉴于此，在妊娠期间进行口交(cunnilinctus，Syn.cunnilingus)也可能是失策之举。上述每一个案例，医生的忠告应该是基于个体的具体情形提出来的（而不能一概而论——译者注），而且应该是针对性伴侣双方的忠告。
随着妊娠的进展，孕妇突出的腹部使得在某些体位的性交不舒适，甚至于不能完成性交。男上位的性交因此不得不排除在外。双方的侧位、男后位或女上位可能更合适和更惬意。记住这一点也许是有用的，那就是性交在许多可能的性行为方式中只是其中的一种，而且其他做爱的方式至少能够足以暂时替代性交。
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Pregnancy
The Woman During Pregnancy
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Sexual Intercourse During Pregnancy
During pregnancy, some women like to have more sexual intercourse while some others would prefer less. Generally speaking, it seems that many women experience an increase in sexual desire during the second trimester of their pregnancy. This desire may then very well diminish during the last trimester.
Whether a woman should have sexual intercourse at any stage of the pregnancy depends, of course, very much
ongner personal feelings. From a purely medical point of view, there is no reason why sexual intercourse should not take place at any time except when explicitly discouraged by a doctor.
Usually, he will advise against it only under the following circumstances:
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1. if it causes vaginal or abdominal pain,
2. if there is any uterine bleeding,
3. when the membranes have ruptured (for details, see "Birth"), and
4. if there is a danger of miscarriage or premature birth due to uterine contractions during orgasm. (In this latter case, it does not make any difference how the orgasm is reached. In other words, masturbation must also be avoided.)
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It has also been suggested that air blown into the vagina during pregnancy may cause serious damage to both the fetus and the woman. For this reason, a certain kind of oral intercourse
(cunnilinctus,Syn.cunnilingus) may also be inadvisable during this time. In each of the above cases, the doctor's advice should be based on the individual situation, and it should be explained to both sexual partners.
As the pregnancy progresses, the woman's protruding abdomen makes sexual intercourse in certain positions uncomfortable and even impossible. Coitus with the man lying on top of the woman may thus have to be ruled out. A side position for both partners, and positions with the man behind the woman, or the woman sitting on top of the man may be more appropriate and enjoyable. It may also be useful to remember that coitus is only one among many possible forms of sexual intercourse, and that, at least for
a while, other kinds of lovemaking can be adequate substitutes.
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