Whisper

Another form of draft beast is the draft slave, male or female. Several males may draw a rubble wagon or a wagon of cut stones in the quarries, or an ore wagon in a mining district, such things. Lighter labors might be assigned to females used as draft slaves. They are often used, for example, to draw the cart of a peddler. Some free women enjoy using harnessed female slaves to draw their carriages, or, chained to their poles, to carry their palanquins.

Plunder of Gor Book 34 Page 170