Source: Didier Descouens, CC BY-SA
Guess what is in the picture?
The answer is penis bone .
In mammals, tin bones are as common as other bones. Even if they narrow the scope to primates, they are still "basic equipment". But why are humans alone not?
ding bone, what's the use of growing it?
First of all, we need to figure out that the common ancestor of humans and primates, mammals that appeared 145 million years ago, evolved into penile bones. Most male mammals today also retain penis bones. So what is the function of the penis bone?
Scientists have proposed several theories about the possible role of penis bones. First, females in some species, such as cats, ovulate only when mating. Therefore, penile bone may play a role in stimulating female and triggering ovulation as soon as possible [1].
Some people also believe that penis bone helps extend the time of insert X intercourse . Unlike humans, wild animals often face fierce competition for mate selection. Therefore, for males, prolonging the insertion time can prevent the female from escaping and mating with other males before its sperm successfully conceives the female, increasing the success rate of mating.
There are also scientists who proposed the "vaginal friction hypothesis", which is not difficult to understand. They believe that penis bones can minimize friction during mating.
Humans lose their penis bones mainly because...
Penis bones can also be seen from human close relatives and primates. It is obvious that human penis bones are lost due to evolution. The reasons for this result may be the following.
xxoo time is too short . The X intercourse time in humans is much lower than that in close relatives primates, and researchers have found that penis bones are always related to longer insert X intercourse time. Humans do not belong to this species that needs to extend their "battery life", so naturally they do not need penis bones to increase their targets.
monogamous . There is also a saying that compared with the cruel competition for mate selection faced by other wild mammals, there is no competition for mate selection for human males. Human beings have evolved into a civilized society over the past thousands of years. Women generally only have "in-depth behaviors" with one man, which is what we call monogamy, so there is no need to use penis bones to fight for spouses.
Women's preferences. Yale University professor Richard Plum proposed a hypothesis that the loss of penis bone may be triggered by the choice of a female spouse [2]. Due to the lack of penis bones, the human penis and scrotum evolved more conspicuously than other species and became more unique in shape. Scientists speculated that the lack of human penis bones is precisely related to the gradual increase in "key organs" and is due to women's preference for "hanging".
There is no bone, how do the little brother "stand up"?
Someone is asking, even if there is no bone, the man's "little brother" will get an erection. What is the process like?
The human penis bone degenerates and disappears, replaced by , which can be congested with cavernosum . This type of cavernosum is very small when it is not congested, so the little male brother is not large when it is not "standing up". When a man is sexually stimulated and enters sexual excitement, the erectile center at the lower end of the spinal cord will receive a signal, transmitting the signal to "under". The tiny blood vessels in the cavernosum body will begin to become congested after receiving this nerve signal, and the little brother will rise and rise, so that he can "stand".
Supplementary Science: Human tines can also "fracture"
Do you know? Although humans do not have penis bones, humans can also "fracture". But this is not a real fracture, but a penis bend caused by the rupture of the cavernosum.
Cavernoid rupture refers to the rupture caused by Ding Ding's blunt external force trauma. During the bang process, the male erection, and the white membrane wrapped in the sponge body will stretch and thin, and the expansion reaches its limit when completely "stand up". At this time, if the posture is incorrect, or the movement is too intense, it is easy to cause the white membrane and sponge body to rupture.When
breaks, you will hear a "click", just like breaking a corn stalk, followed by severe pain, and may also cause problems such as softness, swelling, and discoloration.
If this happens during the banging process, must immediately interrupt the behavior. If it is serious, bandage it with a bandage and apply local ice. Seek medical treatment immediately. is timely surgical treatment to avoid inflammation and necrosis affecting future functions.
This is all about popular science about human penis bones. If you have any questions, please leave a message in the comment area~
Reference:
[1] "Since there are so many benefits of penis bones, why don't humans do it? 》.Fruit Keel.2017-02-15
[2] "Why does a human tin have no bones? 》. Global Science.2019-03-03
[3] Why humans lost their penis bone.David Shultz, Dec.13.2016.
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