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Jerry Kennard, PhD, is a psychologist and associate fellow of the British Psychological Society.
Medically reviewed by Elizabeth Molina Ortiz, MD, MPH on July 13, 2020
Elizabeth Molina Ortiz, MD, MPH, is a board-certified specialist in family medicine and is the former medical director of a community health center.
While there is a reasonable biological explanation as to why women have nipples—to feed babies—their function in men remains less clear.
The Darwinian theory of natural selection would seem to dictate that male nipples serve no real purpose and, as such, should have been bred out of the human species by now. Of course, they have not, and this has to do with the foundations of how a human begins developing in utero.
The answer is simpler than you think. During embryogenesis (the development of an embryo after fertilization), females and males will both start from the same genetic base, so to speak.
It is only in the latter part of the first eight weeks that the sex genes—called the X and Y chromosome—will dictate whether the baby will be female or male. The Y chromosome is the one that differentiates males (who will have one X and one Y chromosome) from females (who will have two X chromosomes).
During the first four to five weeks of gestation, there is no differentiation between sexes even as the embryonic cells continue to divide and specialize. At this point, nipples are already developing.
It is only by weeks six or seven that the Y chromosome will induce changes (by way of the SRY gene) that lead to the development of the testes and the male sex.1
By contrast, female embryos, which are not under the influence of the Y chromosome, will undergo changes in the mammary cells, starting with the development of a pit at the center of each nipple. This pit will gradually form a depression that connects to a lactiferous (milk-producing) duct.
While this happens to some degree in males, it is far less profound and developed.
While male nipples are sometimes thought to be vestigial—meaning that they have become functionless in the course of evolution (much like the appendix or wisdom teeth)—that is largely untrue. They may be more accurately described as remnants of fetal development, but even that suggests they serve no real purpose.
The nipple, in fact, contains a dense supply of nerves that function as a major stimulatory organ in both men and women.2 As such, it can be considered a secondary sex characteristic along with pubic hair, enlarged breasts and widened hips in women, and facial hair and Adam's apple in men.
The male nipple is no less sensitive than the female nipple and can contribute significantly to sexual arousal when stimulated.
With that being said, the nerve network in the male nipple is much denser, meaning that sensory response tends to be more discreet. This response in men and women appears unique to the human species.
There are characteristics associated with the female breast and nipple that can abnormally occur in the male breast and nipple as well. Some are the result of the dysregulation of hormones, while others may be triggered by genetics.
While men will not lactate under usual circumstances, the male breast can produce milk if under the influence of the hormone prolactin.
The condition, known as male galactorrhea, often occurs as a result of a medication or medical condition that triggers a drop in male hormones (primarily testosterone) and an associative increase in female hormones.3
One such example is the drug Motilium (domperidone), which not only treats lactation problems in women but can be used in men to treat nausea, vomiting, gastroparesis, and Parkinson's disease.
Other causes include malnutrition, pituitary gland disorders, hypothyroidism (low thyroid function), and frequent nipple stimulation.
Gynecomastia is the enlargement of male breasts that commonly occurs in older men as testosterone levels progressively drop with age. In addition to the general swelling of breast tissue, gynecomastia can trigger the enlargement of the nipples and surrounding areolas.
Gynecomastia can also affect boys and younger men for any number of reasons. In some cases, the condition will be temporary, particularly in adolescent boys undergoing puberty.
Gynecomastia is associated with an increased risk of breast cancer in men. While rare, breast cancer in men is most commonly detected by the formation of a hardened lump under the nipple and areola.4
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Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.
Kashimada K, Koopman P. Sry: the master switch in mammalian sex determination. Development. 2010;137(23):3921-30. doi:10.1242/dev.048983
Atluri S, Sarathi V, Goel A, Boppana R, Shivaprasad C. Etiological profile of galactorrhoea. Indian J Endocrinol Metab. 2018;22(4):489-493. doi:10.4103/ijem.IJEM_89_18
National Breast Cancer Foundation, Inc. Male breast cancer.
Javed A, Lteif A. Development of the human breast. Semin Plast Surg. 2013;27(1):5-12. doi:10.1055/s-0033-1343989.
Luanow E, Kettler M, Slanetz P. Spectrum of disease in the male breast. Am J Roentgenology. 2011;196: W247-W259. doi:10.2214/AJR.09.3994.
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Verywell Health's content is for informational and educational purposes only. Our website is not intended to be a substitute for professional medical advice, diagnosis, or treatment.
Ⓒ 2021 About, Inc. (Dotdash) — All rights reserved
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https://www.robotbutt.com/2016/06/21/mans-guide-going-shirtless-summer-nipple-type
Перевести · 22.06.2016 · Like Matt Damon’s nipples, these funny little guys are scared of heights! Think about drawing some nipples on to your chest a little higher up and then using a concealer on these gravity-sensitive babies. Talk about “nipple slip!” More Than Two. Yikes! Keep it on, bub. If we wanted to see that many nipples …
https://www.verywellhealth.com/why-do-men-have-nipples-2328794
Перевести · 13.07.2020 · While male nipples are sometimes thought to be vestigial—meaning that they have become functionless in the course of …
Перевести · Последние твиты @MenNipples
https://m.youtube.com/watch?v=arLFPb_dMpI
Перевести · 10.03.2018 · Why do men have nipples? Who are the milkmen? …
https://en.m.wikipedia.org/wiki/Stimulation_of_nipples
Ориентировочное время чтения: 5 мин
Male and female breasts, nipples and areolas develop similarly in the fetus and during infancy. At puberty, the male's breasts remain rudimentary but the female's develop further, mainly due to the presence of estrogen and progesterone, and become much more sensitive than the male ones. Smaller female breasts, however, are more sensitive than larger ones.
https://www.healthline.com/health/nipple-facts-male-and-female
Перевести · 22.01.2018 · One man had seven nipples: Two normal ones and five …
Women’S Health Used to Be Diagnosed Via Nipples
Color was a major factor doctors and nurses considered when reading into a woman’s health. In 1671, the English midwife Jane Sharp published a book...
Your nipples can be flat, protruding, inverted, or unclassified (multiple or divided). It’s also possible to have one breast with a protruding nipp...
The nipple is at the very center portion of your breast, and is linked to the mammary glands, where milk is produced. The areola is the darker colo...
Inverted nipples, which tuck inward instead of protruding out, function the same as “regular,” protracted nipples. It’s possible to have one non-in...
You Can Have Two Nipples on One Areola
This is called double and bifurcated nipple. Depending on the ductal system, both nipples may be able to produce milk for infants. However, when br...
The Average Nipple Height Is The Size of A Lady Bug
In one 2009 study of 300 women’s nipples and areolas, results showed a mean areola diameter of 4 cm (which is a little smaller than a golf ball), a...
Breastfeeding Wasn’T Always The Standard
Though breastfeeding is now common among educated, upper-middle-class women, the same group actually used to oppose breastfeeding their babies. In...
It’s not unusual for breastfeeding moms to experience pain in their nipples for various reasons, including positioning problems during feeding. But...
This happens frequently during pregnancy. One 2013 study of 56 pregnant women showed that their nipples grew in both length and width during the co...
Report All Abnormal Nipple Discharge
Nipple discharge from one or both breasts can be an indicator of health concerns like hypothyroidism and cysts, as well as things like medication c...
https://en.m.wikipedia.org/wiki/Nipple
Перевести · Almost all mammals have nipples. Why males have nipples has been the subject of scientific research. Differences among the sexes (called sexual dimorphism) within a given species are considered by evolutionary biologists to be mostly the result of sexual selection, directly or indirectly.There is a general consensus that the male …
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