I'm a urologist – here's the real reason your penis is shaped like a mushroom

A UROLOGIST has revealed the reason men’s penises are mushroom shaped at the end.

It comes after Google searches on the topic surge.


Dr Stefan Buntrock, a urologist from Göttingen, Germany, shed light on the scientific reasonings.

Speaking on his YouTube account UroChannel, he said the penis acts as a “tool” from an evolutionary point of view.

He said: “From a male perspective, it is logical to make sure to pass on one's own genes to the offspring…

“Evolution has equipped men with several strategies to increase their chances to prevail against the competition, because the woman might have multiple partners.

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“The shape of the penis is one of these strategies.

“Its mushroom shaped head, and especially the coronal ridge underneath the glans, makes it a semen displacement device."

Why would a man want or need to remove semen from the inside of another woman's vagina?

Dr Buntrock said: "Because just in case someone else has deposited his semen, in evolutionary terms, it makes sense to remove that.

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"[This is so that] the other one's genes don't make it into the egg, thus increasing the chances of one's own genes to succeed.”

Dr Buntrock noted a study 20 years ago that first described and tested this theory.

Researchers led by Professor Gordon Gallup from the State University of New York used artificial genitals in a series of experiments.

They deposited fake semen made out of cornstarch and water into an artificial vagina.

Then, they measured how much of the semen could be removed by artificial penises with or without the coronal ridge. 

The artificial penises with a ridge were able to scoop out up to 90 per cent of the "semen" substitute in just one thrust.

But a member with no coronal ridge only managed to remove 35 per cent of the semen.

“The results were very interesting because the penis is working like a plunger,” Dr Buntrock said. 

“Additionally, penetration depth was important. Significant displacement was only noted, when the penis was inserted 75 per cent or more.”

The researchers said that in their research, they found evidence men unconsciously use their penis in his way. 

Dr Buntrock said: “In an additional survey, the researchers evaluated data from 122 male and 173 female undergraduate college students who completed a survey regarding their sexual behavior after a period of separation.

“[The] bottom line was, that almost 70 per cent noted a change in their own and their partners sexual behaviour after a period of separation. 

“Thrusting was reported both deeper, more frequent and more vigorous.

“This means that if the penis is a sperm removal tool, deeper and more vigorous thrusting might be interpreted as a means to remove any possible sperm from other males that got there during the time of separation.

“That doesn't happen on a conscious level, but is performed automatically.”

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Dr Buntrock added: “Whether these findings and explanations are true or not: I think nobody will be able to answer for sure.

“But it sounds like a very logical explanation to me.”

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