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The primary sexual organ of the zaika is their tail. Heavily muscled, these appendages serve a purpose similar to the cloaca of avians or reptiles. The emotional state of the zaika determines whether their tip stiffens and contracts into a phallus or engorges and opens into a vaginal sheathe. The ‘male’ of a pairing will insert their tail into the slitted tip of the ‘female’ and eventually release their sperm. With the same supple, flexible skin as their vestigial breasts, the zaika’s tail is capable of stretching up to four times their natural diameter. Additionally, it is filled with all the sensitive nerves of normal reproductive organs, making the act of penetrating and being penetrated extremely pleasurable. The ovary contained in the base of the recipient’s tail releases a single egg on a monthly cycle and, if fertilized, this egg settles in the zaika’s oviduct to develop. A fully developed egg is typically 6”-9” in height, giving impregnated partners a considerably rounded appearance.