性行为的基本类型

肛交(anal Intercourse)在此被定义为涉及一个人的阴茎与其他人肛门之间的性接触。
因为肛门是身体的较敏锐的性敏感区之一，许多男女在性活动中喜欢某种形式的肛门刺激。事实上，当一些个体自娱(自慰、手淫)时，为了获得额外的刺激，他们可能把自己的手指或某些圆柱形物体插入肛门。因此，在男性之间的性交期间，一个性伴的肛门与另一个性伴的阴茎有时进行直接的接触，这几乎不会令人感到惊讶。

一名男子极有可能把阴茎插入其性伴的肛门。但是，与阴道不同的是，因为肛门不分泌自然的润滑液，使用某些人造润滑液就是明智之举了。特殊的水溶剂型软膏或护肤液是这些润滑液中最合适和最受欢迎的种类；最好轻巧和小心地把润滑液涂抹到肛门本身(而不是性伴的阴茎)。此后，缓慢的插入便可开始了。不过，也有一些男子只是喜欢把阴茎在其性伴的两边臀部之间[1]摩擦。

虽然肛交可以令性伴感到满足，但是这种性交并不比人们常常认为的那样普遍。毕竟，在我们的文化里，因为肛门的排泄功能，现今许多人仍然习惯于认为肛交是猥亵的和令人厌恶的。(就较小的范围看，因为性器官与排尿有关，也被想象成令人厌恶的。)另外，也存在着强烈的宗教和社会禁忌反对肛交。在某些国家，它甚至是一种犯罪。在这种文化背景下，一些同性性交的男人正像许多异性恋者一样强烈地反对肛交也就不足为奇了。

最后，我们仍然要申明，出于解剖结构的原因，在女性之间不可能存在肛交行为。唯一的例外可能是用皮带佩戴上一个人造阴茎的女人。不过，这种可能性是理论大于现实，因为女性性伴双方通常会满足于其他形式的性刺激。

[1].解剖学上叫“臀中沟”。——译者注。

3. Homosexual Intercourse

Anal Intercourse

Anal intercourse is here defined as involving sexual contact between the penis of one partner and the anus of the other.
Since the anus is one of the more sensitive erogenous zones of the body, many men and women enjoy some form of anal stimulation during their sexual activity. As a matter of fact, some individuals insert a finger or some cylindrical object into their anus for additional stimulation when they masturbate. It is therefore hardly surprising that, during sexual intercourse between males, the anus of one partner and the penis of the other should sometimes be brought into direct contact.
It is very well possible for a man to insert his penis into his partner's anus. However, since the anus, unlike the vagina, does not provide its own natural lubrication, the use of some artificial lubricant is advisable. Special water-soluble creams or lotions are the most suitable and popular of these lubricants, and they are best applied gently and deliberately to the anus itself. After that, a slow insertion can begin. However, there are also some men who simply enjoy rubbing their penis between their partner’s buttocks.
While anal intercourse can be satisfying for both partners, it is not nearly as common as is often believed. After all, most people in our culture are conditioned to consider the anus filthy and repulsive because of its excretory function. (To a lesser extent, the sex organs are also seen as disgusting because of their association with the release of urine.) In addition, there are strong religious and social taboos against contact between anus and penis. In some countries, it is even a crime. Under the circumstances, it is hardly surprising that some homosexual men object to anal intercourse just as vehemently as many heterosexuals do.
Finally, it remains to be stated that, for anatomical reasons, there can be no anal intercourse between females. The only exception would be a female who wears an artificial penis strapped to her body. However, this possibility is more theoretical than real, since female couples are usually content with other forms of sexual stimulation.