This is the relevant reference from the Books where Sheathed Swords are mentioned.
I make no pronouncements on these matters, but report them as I find them.
Arrive at your own conclusions.
I wish you well,
From one set of contests, however, I could not, to his surprise, be budged. I had sat on the tiers, close to the fenced enclosure, thrilled. These were contests of sheathed swords, the sheaths chalked with red, so that hits might be noted. The contestants were sturdy men, stripped to the waist, in half tunics, bronzed and handsome, with rippling muscles. As they thrust at one another and fended blows, moving with great speed and skill, in their swift passages, under the watchful eye of the referee, backed by two independent scorers, I could scarcely conjecture what would be involved in actual swordplay, with steel unencumbered with sheaths. I was terrified to consider it. And women, I thought, must abide its outcome. On a cement disk, about a foot high and five feet in diameter, on the opposite side of the enclosure, as though in symbolism of this, a young, naked woman was chained. The chain was on her neck and ran to, a ring anchored in the center of the disk. It was long enough to permit her to stand comfortably which, sometimes, she did. Most of the time, however, she sat or lay, almost catlike, on the disk, watching the fighting. Her body was slim and well formed. Her hair was brightly red and, when she stood, it fell almost to her knees. When the contests had begun she had not seemed particularly interested in them, but, as they had proceeded, she had become more and more attentive. She was now watching them with great closeness. She was the prize. She would be given to the victor.
. . .
Doubtless the men in the audience were intent on the bouts, observing the styles and skills of the contestants, tallying points, and assessing the play. Surely they seemed to have little mind for the chained prize. Surely they seemed eager to applaud, striking their left shoulders, particularly fine a thrusts or particularly tight, fierce passages.
Kajira of Gor Book 19 Pages 111 - 112