性行为的基本类型

也许在此应该提到，少数男人喜欢让性伴把各种各样物体插入自己的直肠。在一些例子里，这些物体可能相当长和相当坚硬，并且在非常罕见的例子中，这名性伴的直肠甚至被插入了整只手（“拳交，fistfucking”）。我们可能只是假设卷入这种行为的男人没有意识到这种行为的危险。首先，存在经由抓伤和蓄积指甲内的污垢感染疾病的可能性。也存在极大的不可能觉察到的内伤危险，而且可能导致严重的内出血、甚至于死亡。此外，尽管肛门括约肌对缓慢插入的、正常大小的阴茎通常能够进行调节，没有被撕裂或没有失去弹性，却可能被一只拳头或其它与拳头大小相当的物体伸展过度。换一句话说，尽管诸如此类的肛交没有造成问题，“拳交”却可能导致严重的损伤，尤其如果“拳交”成为一种习惯时，损伤的可能性更大。已经有这样的病例，肛门功能完全失调，并且不得不由外科医生缝合，然后为了排便，又不得不在病人的腹壁开出一条人工瘘管[1]。

插入肛门或阴道用的振动器
在一些国家，“性用品商店”出售各种各样类型的电池动力的振动器，它们能够用于肛门和/或阴道的插入。其外表通常有乳胶包裹，并且某些种类有着阴茎的形状和像阴茎。某些商店也出售用于各种各样性交目的的肛门塞，甚或出售能够充气的肛门塞。

Vibrators for insertion into anus or vagina
In some countries, “sex shops” sell various types of battery-driven vibrators that can be used for anal and/or vaginal insertion. Their outside is usually made of latex, and some have the shape and look of a penis. Some shops also sell anal plugs, or even an inflatable plug for various sexual purposes.

[1].为了留待排泄器官愈合，用手术开设的替代“自然排泄管”的通道。——译者注。

3. Homosexual Intercourse: Anal Intercourse

Anal Insertions

It should perhaps also be mentioned here that a few men enjoy having their partners insert various objects into their rectum. In some cases, these objects may be rather long and hard, and in very rare cases even the partner’s whole hand is inserted ("fistfucking"). One can only assume that the men involved in this practice are unaware of its dangers. First of all, there is a likelihood of infection through scratches and dirt accumulated under the fingernails. There is also a great danger of internal injuries which may not be felt, but can lead to severe internal bleeding and even to death. Furthermore, while the anal sphincter muscle can usually adjust to a slowly inserted normal penis without being torn or losing its elasticity, it is likely to be overstretched by a fist or other object of comparable size. In other words, while anal intercourse as such does not have to cause a problem, "fistfucking" can lead to serious injuries, particularly if it becomes a habit. There have been cases where the anus became completely dysfunctional and had to be sewn up by a surgeon who then had to create an artificial opening in the abdominal wall for the elimination of waste.