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Why Do Men Have Nipples? by CHM11: 12:16am On Apr 28, 2015 |
This post was influenced by an 11 year old cousin who wants to be a medical doctor. She asked why I have nipples?. It was a weird question that got me thinking. Brace yourselves for a low blow, tough guy. Nipples remind us that gender is anything but clear-cut, especially in utero. Whatever your sex, everyone starts off as a woman in the womb. For the first several weeks a developing embryo follows a "female blueprint," from reproductive organs to nipples. Only after about 60 days does the hormone testosterone kick in (for those of us with a Y chromosome), changing the genetic activity of cells in the genitals and brain. But by then those mammary papillae aren't going anywhere. So the real question is: why do male nipples come equipped with nerves and blood vessels? In many male mammals nipple Formation is stunted by hormones, but not in humans. Did prehistoric men nurse their young? The lack of evidence suggests not. More likely, full-grown nipples — being harmless — don't get weeded out by natural selection. The erection of nipples is not due to erectile tissue, but due to the contraction of smooth muscle under the control of the autonomic nervous system. It is more akin to a hair follicle standing on end than to a sexual erection. Nipple erections are a product of the pilomotor reflex which causes goose bumps. The erection of the nipple is partially due to the cylindrically arranged muscle cells found within it. Nipple erection can also be caused by a tactile response to cold temperature in both males and females. Nipple erection may also result during sexual arousal in females and males, or during breastfeeding. Both are caused by the release of oxytocin. Nipples of both males and females are one of the erogenous zones, which are generally stimulated by hands or by mouth during pre-intimacy, which leads to sexual arousal. The male and female breast have a similar nerve supply but the nerves lie closer together in men, whereas in a female breast they are spread out more widely.[8] After puberty, female breasts turn more sensitive, likely due to hormonal influences. During arousal they generally become stiff, erect and protrude. Nipple stimulation is sometimes intense enough to elicit an orgasm in some women. Research has suggested the sensations are genital orgasms caused by nipple stimulation, and may also be directly linked to "the genital area of the brain". In women, one study indicated that sensation from the nipples travels to the same part of the brain as sensations from the vagina, clitoris and cervix. Nipple stimulation may trigger uterine contractions, which then produce a sensation in the genital area of the brain. From conception until sexual differentiation, all mammalian fetuses within the same species look the same, regardless of sex. In humans, this lasts for around 6 weeks, after which genetically-male fetuses begin producing male hormones such as testosterone. Usually, males' nipples do not change much past this point; however, some males develop a condition known as gynecomastia, in which the fatty tissue around and under the nipple develops into something similar to a female breast. This may happen whenever the testosterone level drops. Gynecomastia, although not as severe, may occur in pubescent boys undergoing physical changes due to the rapid and uncontrolled release of hormones, including estrogen. The heightened levels of estrogen in pubescent male bodies leads to the swelling of the nipple and surrounding tissue – this can often look similar to a female human nipple – and may cause slight discomfort. Thus, because the "female template" is the default for humans, the question is not why evolution has not selected against male nipples, but why it would be advantageous to select against male nipples to begin with. |
Re: Why Do Men Have Nipples? by jerryboiii(m): 12:41am On Apr 28, 2015 |
foolish questionsss |
Re: Why Do Men Have Nipples? by CHM11: 12:51am On Apr 28, 2015 |
jerryboiii:Wouldn't make sense to someone who plays surebet for a living... 2 Likes
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Re: Why Do Men Have Nipples? by jerryboiii(m): 2:22am On Apr 28, 2015 |
f u CHM11: |
Re: Why Do Men Have Nipples? by Cholls(m): 3:50am On Apr 28, 2015 |
my brother simple if u fail to provide for ur family and end up letting ur wife be the provider u have automatically switch positions u r the wife she is the husband so u stay at home take care of the house and breast feed the child. That is why. |
Re: Why Do Men Have Nipples? by Djbaka(m): 2:28pm On May 22, 2015 |
What is a TIP |
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