Kajirus (pl. “kajiri”), (male slaves) also exist on the planet Gor, but they are far fewer than kajirae, since Gorean men can only rarely be effectively “tamed”, so that most male slaves are considered inherently slightly dangerous, and have little value other than as unskilled heavy labor which must often be kept under continual armed guard. The phrase “lo kajirus” is said to mean “I am a slave-boy.” Men conquered in war who are not left free are more often killed than enslaved, while women in the same situation are almost always enslaved (since kajirae are a readily-negotiable commodity, among other reasons). A male slave kept by a woman owner for bedroom duties is a “silk slave” (while most male slaves on Gor are used for hard labor in work gangs). When a free woman makes use of a kajirus sexually, he is often chained so that he is unable to hold her in his arms — since allowing this would be considered to add a note of male domination to the lovemaking. Some free women carefully avoid kissing a kajirus when making sexual use of him, since they would consider it degrading to soil their lips by touching them to the body of a mere slave. Note that only a small minority of rich free women on Gor own silk slaves, and (in contrast to the usual situation with free men and kajirae) it is often not very easy or convenient for a free woman to obtain the sexual use of a kajirus whom she does not personally own (in the city of Ar, the largest city of known Gor, it is strictly forbidden by law). Silk slaves are generally despised by free men on Gor, and their type of slavery is often considered to be rather unnatural. Kajiri do not usually wear locked collars; rather, a band of iron.