Kobolds are androbi, sex feeders who feed on both males and females of other species, in this case on semen, vaginal secretions, and milk. To assist feeding on females, kobold tongues are long and prehensile, and possess a penis-like tip with prehensile nubs that aid in pleasuring female prey/cattle. Their saliva is also a natural, mild sensitivity enhancer.

Breeders can produce a thick, purple jelly from their tongue and gums at will. This jelly contains a cocktail of hormones that the breeder can adjust for any species. When ingested or lathered on thinner tissues and membranes, this hormone jelly begins causing changes in the subject's natural hormone production. Aided by these hormonal changes, the musculature, nervous system, and re-optimizes the body so that arousal is its default state. In this state, females lactate and produce vaginal secretions at all times, while males' testicles will expand their production and storage capacity for semen, and the penis will stay erect at all times. For males in particular, having an erection becomes the body's default state. The male's penis will become flaccid for periods when necessary, but will never remain in that state for more than an hour or two. Remaining flaccid for more than four hours at a time becomes unhealthy. In addition, male and female subjects alike will have their brain chemistry altered slightly to become incapable of orgasming via masturbation. The completion of these alterations requires approximately two weeks of regular hormone jelly consumption. Breeders will usually spend 2-3 weeks "marinating" newly captured cattle for this reason, using their jelly, milk, and artificial salves and potions.

Once the hormonal alterations are complete, the hormone jelly has an additional effect that lasts only for as long as it is ingested regularly; it imparts part of the kobolds' own genetic chimera nature on the subject, allowing them to crossbreed with species that they would normally be incompatible with. This chimera-breeding has limits; two species can be too different to crossbreed even with the jelly's effects. However, it nonetheless makes it significantly easier for kobolds to breed their cattle.

Kobold vaginal canals serve both as their main method of sexual feeding and their method of laying eggs. To this end, it leads to both a semen-collecting and processing stomach and a normal uterus. The kobold's cervix is significantly larger than in most animals, consisting of a pair of strong muscle bundles and a muscular uterine "beak". The uterine beak and its associated muscles aid with laying eggs, making the process smoother for kobolds than with most egg-laying animals, but its main purpose is to close around the head of an inserted penis, thereby preventing movement or pull-outs. It is aided in this task by prehensile nubs further down the canal that can extend to catch on knots, medial rings, or other penile features to further prevent escape. Both of these mechanisms can be triggered at will by the kobold. Movement is not necessary to stimulate the inserted penis (or the kobold herself) thanks to the rather strong and precise muscles of the kobold's vagina.