Enslavement
The institution of capture is universal, to the best of my knowledge, on Gor; there is no city which does not honor it, provided the females captured are those of the enemy, either their free women or their slaves it is often a young tarnsman's first mission, the securing of a female, preferably free, from an enemy city, to enslave, that his sisters may be relieved of the burden of serving him; indeed, his sisters often encourage him to be prompt in the capture of an enemy wench that their own tasks may be made the lighter; when the young tarnsman, if successful, returns home from his capture flight, a girl bound naked across the saddle, his sisters welcome her with delight, and with great enthusiasm prepare her for the Feast of Collaring." Assassin of Gor page 159
The principle he had alluded to pertains to conduct in a free woman which is taken as sufficient to warrant her reduction to slavery. The most common application of this principle occurs in areas such as fraud or theft. Other applications may occur, for example, in cases of indigence and vagrancy. Prostitution, rare on Gor because of female slaves, is another case. The women are taken, enslaved, cleaned up and controlled. Indulgence in sensual dance is another case. Sensuous dance is almost always performed by slaves on Gor. A free woman who performs such dancing publicly is almost begging for the collar. In some cities the sentence of bondage is mandatory for such a woman."  Renegades of Gor page 372
...where bravery is highly esteemed and to save a female's life is in effect to win title to it, for it is the option of a Gorean male to enslave any woman whose life he has saved, a right which is seldom denied even by the citizens of the girl's city or her family. Indeed, there have been cases in which a girl's brothers have had her clad as a slave, bound in slave bracelets, and handed over to her rescuer, in order that the honor of the family and her city not be besmirched...There are cases where a free woman has deliberately placed herself in jeopardy." Priest Kings of Gor page 161
"..but in the end, it is you who are the slave; it is you who will lose. On Earth you had the society at your back, the result of centuries of feminization; he could not so much as speak harshly to you but you could rush away or summon magistrates; here, however, society is not at your back, but at his; it will abet him in his wishes, for you are only a slave; you will have no one to call, nowhere to run, you will be alone with him, and at his mercy. Further, he has not been conditioned with counter-instinctual value sets, programmed with guilt, taught self-hatred; he has been taught pride and has, in the very air he breathes, imbibed the mastery of females. These are strong, and they are hard, and they will conquer you. For a man of Earth, you might never be a woman. For a man of Gor, I assure you, my dear, sooner or later you will be." Tribesman of Gor page 12
The intelligence and sensitivity of many women actually tends to blossom in bondage, finding within it the apt environment for its expression, for its flowering. This may have to do with such matters as the release of inhibitions, happiness, fulfillment, and such." Magicians of Gor page 194.
Sometimes, however, the free woman in a captured city is not, say, simply stripped, thrown down and tied, later to be turned over to an iron master for the searing kiss of his white hot metal. Sometimes, rather, she is stripped, and presented before officers, is offered the choice between swift, honorable decapitation and slavery. If she chooses slavery, she may be expected to step onto a submission mat, and kneel there, head down, enter a slave pen of her own accord, or, say, fully acknowledging herself a slave, belly to an officer, kissing his feet.  The question is sometimes put to her in somewhat the following fashion. 'If you are a free woman, speak your freedom and advance, now, to the headman's block, or, if you are truly a slave, and have only been masquerading until now as a free woman, step now, if you wish, upon the mat of submission and kneel there, in this act becoming at last, explicitly, a legal slave.' She is then expected, sometimes, kneeling to lick the feet of a soldier, who then rapes her on the mat. It is commonly regarded as an acceptable introduction for a woman to her explicit and legal slavery." Blood Brothers of Gor page 337
Willing Submission
It should be noted that this does not place a legal obligation on the warrior. It has to do, rather with the proprieties of the codes. If a woman not within a clear context of rights, such as capture rights, house rights, or camp rights, should pronounce herself slave, simplicitor, then she is subject to claim. These claims may be explicit, as in branding, binding and collaring, or as in the uttering of a claimancy formula, such as, 'I own you,' 'You are mine,' or 'You are my slave,' or implicit, as in, for example, permitting the slave to feed from your hand or follow you." Players of Gor page 16-7, 21
If and when a free woman should utter this, in the Gorean culture, of course, this sort of thing is very significant. Indeed, in some cities such things as kneeling before a man, or addressing him as "Master" effects legal imbondment on the female, being interpreted as a gesture of submission." Players of Gor page 139
"Often," I said. Indeed, a female slave is the easiest of all women to love; too, of course, she is the most natural of all women to love; these things have to do with the equations of nature, in particular with those of dominance and submission. To a man a female slave is a dream come true. A free woman, understandably, cannot even begin to compete with a female slave for a man's love. That is perhaps another reason why free women so hate their vulnerable, imbonded sisters. If a free woman would assure herself of her man's love she could not do better than, in effect, become his slave. She can beg of him, of she senses in herself the true bondage of love, an enslavement ceremony, in which she proclaims herself, and becomes his slave. In their most secret and imitate relations thereafter she lives and loves as his slave. If a woman fears to do this she may, on an experimental basis, resort to limited self-contracting, in which her documents will contain stated termination dates. Thus, by her own free will, she becomes a slave for a specific period, ranging from an evening to a year. The woman enters into this arraignment freely; she cannot, of course, withdraw from it in the same way. The reason for this is clear. As soon as the words are spoken, as her signature is placed on the pertinent document, or documents, she is no longer a free person. She is then only a slave, an animal, no longer with any legal powers whatsoever. She is, then, until the completion of the contractual period, totally subject to the will of the master." Blood Brothers of Gor page 101
Face-Stripping
"'If you are free,' said one of them, 'you should be ashamed of yourself being seen on the bridges so clad.' 'Well,' said Elizabeth, 'if you like walking around wrapped up in blankets, you are free to do so.' 'Shameless!' cried the free girl. ' 'You probably have ugly legs,' said Elizabeth. 'I do not!' retorted the girl. 'Don't choke on your veil,' advised Elizabeth. 'I am really beautiful!' cried the free girl. 'I doubt it,' said Elizabeth. 'I am!' she cried. 'Well then,' said Elizabeth, 'what are you ashamed of?' Then Elizabeth strode to her and, to the girl's horror, on one of the public high bridges, face-stripped her. The girl screamed but no one came to her aid, and Elizabeth spun her about, peeling off layers of Robes of Concealment until, in a heavy pile of silk, brocade, satin and starched muslin the girl stood in a sleeveless, rather brief orange tunic, attractive, of a sort sometimes worn by free women in the privacy of their own quarters." Assassin of Gor page 74
"For example, sometimes free women attempt, sometimes even disguising themselves, to spy on the doings of masters and slaves. For example, they might attempt, disguised as lads, to gain entrance to paga taverns. And often such entrance in granted them but later, to their horror, they may find themselves thrown naked to the dancing sand and forced to perform under whips. Similarly if they attempt to enter such establishments as pretended slaves they may find themselves leaving them by the back entrance, soon to become true slaves. In many cities, such actions, attempting to spy on masters and slaves, disguising oneself as a slave, garbing oneself as a slave, even in the supposed secrecy of one's own compartments, lingering about slave shelves and markets, even exhibiting an interest in, or fascination with, bondage, can result in reduction to bondage. The theory is apparently that such actions and interests are those of a slave, and that the female who exhibits them should, accordingly, be imbonded." Magicians of Gor page 50
Once in Ar.. several free women, in anger at slaves, and perhaps jealous of the pleasures of masters and slaves, entered a paga tavern with clubs and axes, seeking to destroy it.. The men in the taverns, being Gorean, and thus not be inhibited or confused by negativistic, antibiological traditions, quickly disarmed the women. They then stripped them, bound their hands behind their back, put them on a neck rope, and, by means of switches, conducted them swiftly outside the tavern. The women then, outside the tavern, on the bridge of twenty lanterns, forced to witness the burning of their garments." Magicians of Gor page 51