"What is it?" I asked, startled. It seemed he had produced this almost by magic. It was a soft, leather bota-like flask, drawn from within his tunic. "Slave wine," he said. "Need I drink that?" I asked, apprehensively. "Unless you have had slave wine," he said, "I have no intention of taking you through the streets clad as you are. Suppose you are raped." I put the flask, which he had opened, to my lips. Its opening was large enough to drink freely from. "It is bitter!" I said, touching my lips to it. "It is the standard concentration, and dosage," he said, "plus a little more, for assurance. Its effect is indefinite, but it is normally renewed annually, primarily for symbolic purposes." I could not believe how bitter it was. I had learned from Susan, whom I had once questioned on the matter, the objectives and nature of slave wine. It is prepared from a derivative of sip root. The formula, too, I had learned, at the insistence of masters and slavers, had been improved by the caste of physicians within the last few years. It was now, for most practical purposes, universally effective. Too, as Drusus Rencius had mentioned, its effects, at least for most practical purposes, lasted indefinitely. "Have no fear," said Drusus Rencius. "The abatement of its effects is reliably achieved by the ingestion of a releaser."
Kajira of Gor pg 130

[Wine and the prevention of pregnancy] "Slave wine is bitter intentionally so. Its effect last for more than a Gorean month. I did not wish the females to conceive, A female slave is taken off slave wine only when it is her Masters intention to breed her."
Marauders of Gor pg 23-24

"He proffered me a cup and I with one hand holding the blanket about me with the other drank its contents. It was a foul brew but I downed it. I did not know at the time but it was slave wine. Men seldom breed upon their slave girls."
Slave Girl of Gor pg 69

"I held the object before her. She regarded it with dismay, "I have already chewed sip root within the moon." she said. She did not need the sip root of course for as she had pointed out she had had some within the moon and indeed the effect of sip root in the raw state in most women is three or four moons."
Blood Brothers of Gor pg 319

[**Quotes showing SLAVE WINE Lasts indefinitely**] "In the concentrated state as in slave wine developed by the Caste of Physicians, the effect [of sip root] is almost indefinite, usually requiring a releaser for its remission, usually administered to a slave in what is called breeding wine or second wine."
Blood Brothers of Gor pg 319

"This is not really wine, or an alcoholic beverage. It is called slave wine, I think, for the amusement of the Masters. It is extremely bitter. One draught of the substance is reputed to last until the administration of an appropriate releaser. In spite of this belief however or perhaps in deference to tradition, lingering from earlier times, in which, it seems less reliable slave wines were available, doses of this foul stuff are usually administered to female slaves at regular intervals usually once or twice a year. Some girls rather cynical ones, I suspect speculate that the Masters give it to them more often than necessary just because they enjoy watching them down the terrible stuff."
Dancer of Gor pg 174

[Second wine - reversing slave wine] "The active ingredient of breeding wine or second wine is a derivative of teslik."
Blood Brothers of Gor pg 320