Before explaining this problem
We first need to figure out
What is tin bone?
This thing
As the name suggests, it is the bones in the tin
Most of them are stick-shaped
However, with different species, its shape also changes certainly
The tin bones of male walrus are like batons
The top of the tin bones of squirrels are spade-shaped, and there are also sharp teeth
In addition,
It is not connected to other bones
When summoned, it will be pushed to the tin tin
The role of
in the qualitative part of the
provides many conveniences and benefits for animals to "applaud"
Benefits 1: Trigger ovulation
For some species,
ovulation only when it reaches xxoo (like a female cat)
So some people think that tin bone can stimulate ovulation
Benefits 2: Overcome friction
Scientists also proposed the "friction hypothesis"
(vaginal Friction hypothesis)
believes that tin bones can make males overcome friction
makes it easier for themselves to enter females
Benefits 3: Help reproduce
Some people also believe that tin bones can prolong the time
Because for males,
prolong the time can reduce females
chance to mating with other males
This theory is called "cock-blocking" (cock-blocking)
This behavior also means that
can increase the chance of female pregnancy
gives males more initiative
Why do humans have no tin bones?
Actually, a long time ago
Our direct ancestor ape
is
But the reason why tin bones were evolved and eliminated
mainly have the following three reasons
1: monogamous marriage method
This method produces
reduces a large number of competitors for men
Old men no longer need to hurry up and let females conceive before
competitors come
After all, animals must seize the time to conceive
while humans have no time limit
2: The time is too short
generally has tin bones The animals
Their xxoo time is relatively long
and the average time of humans
is usually within 7 minutes...
So
Tin bones don't seem necessary for humans...
3: DNA loss
American orthopedic expert Philip Reynold
A article published in the journal Scientific American says that
Humans have more than 500 sets of DNA fragments
has been missing over time
which includes the DNA related to tin bones 2
4: Women's choice preferences
Yale Professor of Ecology and Evolutionary Biology O. Prum
once put forward a view that belongs to the aesthetic category.
says that women prefer tin bones missing
and men with larger tin bones
so they can get more opportunities to reproduce
Seeing this
Maybe some friends will have questions
Without tin bones, what does humans rely on xxoo?
Nowadays,
male compatriots want ♂♂
mainly rely on sponge congestion
Every time you participate in the applause of love
cavernosate will complete the mission from soft to hard
I believe that old men have learned more about their bodies after reading
so
comments and likes!
-end-
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References:
[1]Matilda Brindle, theconversation.com, How penis bones help principals win the mating game – and why humans might have lost theirs
[2]Human-specific loss of regulatory DNA and the evolution of human-specific traits, nature.com, Cory Y. McLean, Philip L. Reno, Alex A. Pollen, Abraham I. Bassan, Terence D. Capellini, Catherine Guenther, Vahan B. Indjeian, Xinhong Lim, Douglas B. Menke, Bruce T. Schaar, Aaron M. Wenger, Gill Bejerano & David M. Kingsley
[3] Wang Yi. Humans have evolved the tail twice. Science Grand View Garden, 2017(4): 61-61.
[4] Cao Linsheng, Zhou Huiliang. The pathogenesis of abnormal erection of Dingding and its treatment. Chinese Journal of Orthodontic Science, 2005, 19(2): 66-69.
[5] AlanDIXSON JennaNYHOLT Matt ANDERSON. There is a positive correlation between the length of tinton bones in mammals and the elongated insertion pattern. Acta Zoology, 2004, 50(4): 490-503.
[6] Zhang Yingao, Hu Liquan. A new view on the erectile mechanism of tinton erectile-the role of nitric oxide in tinton erectile. Journal of Hubei University for Nationalities: Medical Edition, 1997(1): 45-48.
