...some body parts are dark even if its under a garment?
As for the dark color of the skin of the scrotum, is the subject of sex hormones. Originally, people
depend on a variety of color pigment, in particular, the number of melanoma, the thickness of the
skin and blood vessel relaxation or contraction of the state. Melanosis affected skin is an important factor in sex hormones. Sexual organs, such as parts of the high concentration of sex hormones, hormone to stimulate the long-term results so that a large number of melanoma skin color and become very calm, especially after the more obvious thickening of shrinkage. For the same reason, you may also have taken note of the adult men in a circle around the nipple and areola color and quite right! Little boy and the very low levels of sex hormones, so do not change color, similar to color in and around the scrotum, puberty before this change in pigmentation.
- http://www.wellsphere.com
Groins darken because of friction. Even if you have a flawless skin, having a dark inner groin could be unsightly. There are many reasons why the inner groin turns dark. Usually, dark inner groin is the result of wearing tight underwear or clothing. It can also be due to friction and the constant rubbing of the elastic band of your underwear against your inner thighs or skin. Armpit looks dark because of the shadow of the hair? There are a lot of reason the underarm is dark or looks dark. (1) When you shave you cut the hairs off at, or just below, the surface of the skin. If your hairs are slightly darker than your skin color, they can give an illusion that your skin is stained. (2) According to at least one dermatologist, dark spots under your arms are the result of
dead skin cells that are trapped in microscopic “hills and valleys” on your skin. (3) In theory, some ingredients in deodorants could be reacting with the skin to cause discoloration. (4)A medical condition called acanthosis nigricans also causes darkening of the skin. This condition
causes light-brown-to-black markings on the neck, under the arms, or in the groin. It typically occurs in people who are overweight.
...do we have hairs on the armpit and around genitals?
It naturally wicks sweat or other moisture away from the skin, aiding in keeping well-ventilated skin dry enough to prevent colonization by odor-producing bacteria. Underarm hair may also provide a natural anti-friction quality between the upper arm and the thorax. A more controversial view, and my favorite theory, is that it may facilitate the release of sexual-attractant pheromones from the underarm areas, correlating with its appearance, along with other kinds of androgenic hair, during sexual development. The groin and armpit have a lot more pores than the rest of the body, so the hair is there to soak up all those chemical signals leaking out and present them to the world.
...are underarm and groin hairs curly, anyway?
Do you have a microscope? If you have, try to look the cross-section of the hair under it. Under the microscope you will notice that it is not round, but oval shaped. This observation is the reason why pubic hair, beard hair, and armpit hair are all curly. Because round hairs will lie next to one another because they are all round, but oval hairs will tend to curl around so that the flatter edge is resting in an up/down direction.
...we shiver after a pee?
The "Pee Shakes", "Urination Shivers", or "Post-Micturition Convulsion Syndrome", however you call it, is a tingling sensation down your spine that you feel during or right after peeing. The feeling is similar to the shivering you experience in cold weather. According to research, more males have experienced this than females (about 7 males to every 5 females). Some claim changes in the nervous system occur when the bladder is relaxed, which cause you to shake involuntarily. It's more likely that the rapid release of warm fluid lowers your overall body temperature, which causes you to react the way you would in a cold breeze.
...wear watch on your left hand?
It's done like that so it doesn't get in the way of their dominant hand. The dominant hand (for most people this is the right hand) is involved in many more activities and therefore is at greater risk of damaging the watch. Plus it does get in the way when doing everyday things. If you are left handed you can always get a left handed watch (see related links). It goes back to the time of wind up watches, the mechanism was easily accessible for right handed people to wind the watch. It makes things a little risky when drinking coffee when are hurrying towards work and you watch the time. You could pour yourself with your own hot coffee.
...yawn is contagious?
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