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性行為的基本類型
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2.
異性性交:
異性生殖器性交
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性交合
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後位性交合
（保加利亞瓦爾納地區的泥塑，約西元前2000年） |
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Coitus from behind
Clay sculpture, Varna region, Bulgaria, ca. 2000 B.C. |
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性交合的技巧
1
一般而言，適當地告知夫妻不要貿然而倉促開始性交合，而要從容不迫，以深思熟慮的方式逐漸展開。例如，他們可能會發現首先以某種手交或口交更為有益。以這種方式，女性在性交合之前甚至就可能享受到性高潮。至少，只有當陰道已經自然分泌足量的潤滑液時才應該去嘗試性交合。如果沒有這種潤滑，陰莖的插入對雙方都能夠造成疼痛。（在一些女性，僅僅隨著歲月的推移，陰道自然分泌液可能就會逐漸變少。這種症狀通常通過激素療法可以得到改善。在市場上也有某種預塗潤滑液的避孕套可供購買，它原來也可以改善這樣的症狀。不過，一些諸如凡士林這樣的人造家用潤滑液，可以用來進行手交，但不應該用於陰道潤滑。）
一旦女方的陰道充分地潤滑了，男方就可以逐漸插入陰莖。不需要立即插得很深，因為儘管女方已經性興奮起來了，她仍可能有一陣子會感到緊張。在這種情況下，男方剛好用陰莖頭在陰道外方和緩地前後滑動，通常能夠有助於讓女方放鬆。然後，當她意欲交接的時候，她可以以自己骨盆的聳動加深陰莖的插入。哺乳動物在性交中的骨盆聳動出於“自然”，而且，事實上能夠在人類的嬰兒中觀察到這種現象，當他們開始去探索自己的性反應的時候，他們就會有骨盆的聳動動作。不過，這可能是作為本能的行為，能夠極大地與富有經驗的愛人的實踐加以改進。 |
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Basic Types of Sexual Behavior |
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2. Heterosexual Intercourse: Genital Intercourse |
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Coitus |
Techniques of Coitus 1
In general, couples are well advised not to begin coitus suddenly and hastily, but to take their time working up to it in a deliberate fashion. For instance, they may find it more rewarding to engage first in some kind of manual or oral intercourse. This way a woman may even enjoy one or several orgasms before coitus. At any rate, coitus should be attempted only when the vagina has produced enough of its own natural lubrication. Without such lubrication the insertion of the penis can be painful for both partners. (It is only with advancing age that the natural vaginal lubrication may become insufficient in some women. The condition can usually be improved by hormone therapy. There are also some prelubricated condoms on the market which may prove helpful in such cases. However, certain artificial household lubricants, such as Vaseline which can be used in manual intercourse, should not be introduced into the vagina.)
Once the woman's vagina is sufficiently lubricated, the man can gradually insert his penis. There is no need to penetrate very deeply right away, because, in spite of her sexual excitement, the woman may still feel a little tense for a while. In this case, the man can often help her relax by slowly moving just the tip of his penis back and forth in the outer part of the vagina. Then, when she feels like it, she can deepen the penetration by her own pelvic thrusting. Pelvic thrusting during sexual intercourse comes "naturally" to all mammals and can, in fact, already be observed in human infants when they begin to discover their sexual responses. However, instinctual as this behavior may be, it can be greatly improved upon by experienced lovers. |
