The initial appearance of the fetal genitalia looks basically feminine: If pheromones exist for humans, they would likely be secreted by a mixture of liquid from the apocrine glands with other organic compounds in the body. The entire breast has a network of nerve endings, and it has the same number of nerve endings no matter how large the breast is, so that larger breasts may need more stimulation than smaller ones. Some people also like being bitten gently in these areas, often to the point that a " hickey ", or "love-bite" is formed. Intersex is the development of genitalia somewhere between typical male and female genitalia.
The SRY gene , usually located on the Y chromosome and encoding the testis determining factor , determines the direction of this differentiation. If they pick the wrong one, their child may begin to show symptoms of transsexualism , which can lead them to a life of discomfort until they are able to remedy the issue. The mucocutaneous end-organs are formed after birth, with few in newborn infants and many well-organized endings in adults. Biting at the lip can also provide stimulus. Vater-Pacini corpuscles are present. Navel fetishism and Alvinolagnia Many people find stimulation kissing, biting, scratching, tickling, caressing of the abdomen to be pleasurable, especially close to the pubic region. An exaggerated tickle and anticipatory response are responsible for the heightened sensual response. Each sex organ in one sex has a homologous counterpart in the other one. Similarly, massaging the sole of the foot can also produce stimulation. Neck[ edit ] The neck, clavicle area and the back of the neck are very sensitive in both males and females, which can be stimulated by licking, kissing or light caressing. The hair surrounding the areola adds additional sensory tissue. In a larger perspective, the whole process of sexual differentiation also includes development of secondary sexual characteristics such as patterns of pubic and facial hair and female breasts that emerge at puberty. Furthermore, differences in brain structure arise, affecting, but not absolutely determining, behavior. The sides of the fingers are somewhat less sensitive and more ticklish. The entire breast has a network of nerve endings, and it has the same number of nerve endings no matter how large the breast is, so that larger breasts may need more stimulation than smaller ones. The initial appearance of the fetal genitalia looks basically feminine: An exaggerated tickle on the back of the legs and knees can also be sensitive for some. Development of the reproductive system In typical prenatal development , sex organs originate from a common primordium during early gestation and differentiate into male or female sexes. If pheromones exist for humans, they would likely be secreted by a mixture of liquid from the apocrine glands with other organic compounds in the body. If the fetus has testes, and if the testes produce testosterone, and if the cells of the genitals respond to the testosterone, the outer urogenital folds swell and fuse in the midline to produce the scrotum; the protuberance grows larger and straighter to form the penis; the inner urogenital swellings grow, wrap around the penis, and fuse in the midline to form the penile urethra. Intersex is the development of genitalia somewhere between typical male and female genitalia. These zones are apparently mucocutaneous skin. Many people are extremely ticklish in the foot area, especially on the soles. No Meissner's corpuscles and few organized nerve endings are present. The mass of smooth muscle and glandular-duct tissue in the nipple and areola block the development of normal dermal nerve networks which are present in other erogenous regions and the development of special end organs. Intense nipple stimulation may result in a surge in the production of oxytocin and prolactin which could have a significant effect on the individual's genitals, even to the point that some people of both sexes can achieve orgasm through nipple stimulation alone. All amphibians, birds, reptiles, some fish, and a few mammals monotremes, tenrecs, golden moles, and marsupial moles have this orifice, from which they excrete both urine and feces in addition to serving reproductive functions.
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