Caitian Physiology
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Reproductive Physiology
Male Reproductive Physiology
The Caitian male's primary reproductive system is similar in most respects to other humanoid species. The basic anatomy is the same and fluids produced are not known to cause reactions in any species. The Caitian penis is larger in girth(averaging 2" wide/6.3" around) and length (averaging around 6.8") then a typical human. While the vagina of most humanoid females can accept the Caitian's girth without any discomfort (the larger girth described as 'filling' or 'stretching') the longer length can cause discomfort if complete penetration is attempted on the part of the male.
The Caitian penis, while similar in basic shape, has two noticeable differences. The head of the penis is pointier in shape, an evolutionary adaptation for reproduction in the species. The shaft is also covered with numerous rear facing fleshy barbs. These barbs, unlike those of the Terran Feline, are soft and supple. The barbs, when mating with a Caitian female, are used to stimulate ovulation. In non-Caitians, the barbs have been described as providing an extremely pleasurable sensation during copulation.
Female Reproductive Physiology
As with the male, the female reproductive system is similar in many respect to other humanoid species. The basic anatomy is the same and fluids produced are not known to cause reactions in any species. The female vagina differs from most humanoids in that it is covered in small fleshy nubs inside. These nubs are designed to interact with the male's barbs, triggering ovulation during the final stages of mating. As with the males barbs, humanoids of the opposite sex have often described these nubs as heightening pleasure during intercourse.
Female Caitians possess two pair of mammalian breasts, an upper and a lower pair. The upper pair tend to follow to human norms, exhibiting some variation in size. The second (lower pair) while these tend to be comparatively quite small, swell to noticeable (and to a Cait, unwieldy) size only in mothers, and slowly returning to their original size after the young are weaned. As their primary function is to nourish offspring during their infancy, the breasts are normally not very sensitive.
Caitian females go through an semi-annual heat cycle from the onset of puberty into their early 50's. The cycle tends to last a period of a week. During the heat cycle, the female tends to be more amorous towards her partner, wanting more physical intimacy then normal. Females without a partner typically will seek out a partner during this time, the desire to mate being extremely strong.
Copulation/Mating
Mating in the Caitian species occurs much like other humanoid species. Both partner's stimulate each other during foreplay, eventually resulting in the male inserting his penis into the female's vagina. Continued stimulation brings both partners to the peak of their sexual pleasure, triggering orgasm in both partners, the release of semen into the female, and the afterglow.
Caitian mating differs somewhat from traditional humanoid mating. During the pair's climb to orgasm, the female's cervix loosens somewhat, permitting the male's erect penis to penetrate deeper inside her body, the head slowly stretching her cervix in preparation for the climax of their mating. Meanwhile, the combined stimulation of the male's barbs against the female's vaginal walls triggers an ovulation response, releasing 3-4 eggs to be fertilized. In inter-species mating, the female response to the males penis scraping along her vaginal walls is lessened somewhat, triggering a release of 1 or 2 eggs at most, and in approx 30% of cases, no eggs are released.
At the moment of climax, the male penis has sufficiently stretched the female's cervix that the head of the penis penetrates past the cervix, directly entering the female's womb. This final penetration triggers the female's cervix to clamp down on the male's penis, locking him inside her body for the remainder of their coupling. This triggers the male's penis to ejaculate into the female's body, typical volume during release being several tablespoons or more.
As the pair come down from their orgasm, the female's cervix eventually releases it's grip on the male penis. Pulling out, the barbs in the male serve one final purpose, that of triggering the female's cervix to clamp shut, sealing the male's seed inside her womb giving the sperm a chance to fertilize the eggs released earlier during mating.
After mating, both partners typically enter a lethargic stage during which further copulation is impossible.
Heat Cycle
Caitian females go through an semi-annual heat cycle from the onset of puberty into their early 50's. The cycle tends to last a period of a week. During the heat cycle, the female tends to be more amorous towards her partner, wanting more physical intimacy then normal. Females without a partner typically will seek out a partner during this time, the desire to mate being extremely strong.
Sexual Development
Caitian development in many ways resembles Terrans in their development. Caitian cubs begin puberty in their early teens, becoming fully sexually developed by around age 18. While the onset of puberty does include the onset of the heat cycle, in younger Caitians, the drive to mate is lessened and tends to manifest as an increased interest in her spending time with male freinds. As she grows older the female's desire to mate increases though does not reach it's full intensity until she has bonded with a male and copulated with him at least once.