"A bitter root, which can either be made into a liquid contraceptive, or chewed, for the same result. The effect of the sip root, inmost women is effective for three or four months. In the concentrated state, as in slave wine, developed by the caste ofPhysicians, the effect is almost indefinate, usually requiring a releaser for it remission, usually administered, to a slave, in what is called the breeding wine, or the second wine"

Book 9, Marauders of Gor, page 23

"Sip roots were extremely bitter. Slave wine, incidentally, is made from sip roots. The slaves of the red savages, like slaves generally on Gor, would be crossed and bred only as, and precisely as, their masters might choose."

Book 18, Blood Brothers of Gor, page 125

"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 the sip root, in the raw state, in most women, is three or four moons. In the concentrated state, as in slave wine, developed by the caste of physicians. the effect is almost indefinite, usually requiring a releaser for its remission, usually administered, to a slave, in what is called the breeding wine, or "second wine". When this is administered, she usually knows she has been selected for crossing with a handsome male slave."

Book 18, Blood Brothers of Gor, page 319

"The active ingredient inbreeding wine, or the "second wine", is a derivative of teslik.
In the matter of bitterness of taste there is little to choose from between raw sip root and slave wine, the emulsive qualities of the slave wine being offset to some extent by the strength of the concentrate involved."

Book 25, Magicians of Gor, page 320