Humans Do Not Have A Penis Bone Due To Monogamy

Posted: Dec 15 2016, 9:24am CST | by , Updated: Dec 15 2016, 9:26am CST, in News | Latest Science News

 

Humans Do Not Have a Penis Bone due to Monogamy
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  • Humanity’s Monogamous Status is the Evolutionary Reason behind our Lacking a Penis Bone
 

Apparently, humanity’s monogamous status is the real evolutionary reason behind our lacking a penis bone.

Many species besides man have not developed a bone in their penises. Yet evolution lends us a clue as to how the penis bone formed over time in mammals and primates. This is known as the baculum.

The reasons behind this lack of a baculum is that we are a monogamous species and don’t compete for our partners like Alpha Males. In those mammals that have a penis bone, the length, width and overall appearance of this bone varies. 

The marmoset’s bone is 2 mm in length. As for the walrus’s penis bone, it is 60 cm in length. Humans do not possess a baculum, according to DailyMail. However, early primates and meat-eating animals did possess one.

The baculum underwent formation in mammals 145 and 95 million years ago. It was a lengthy period of penetration between males and females that favored the formation of a baculum in the males. This was 3 minutes or more.

All primates showed this over the course of the timeline. As the lengthy periods increased in duration, the length of the baculum also became more pronounced. 

Both primates and carnivores showed this tendency. Sexual competition between primates also showed this trend towards a longer baculum. It is the monogamous habit of humans that in the final analysis led to the disappearance of the baculum.

When each male has access to one female alone, there is little if any sexual competition. While monogamy may be monotonous, it wards any overt signals of male jealousy.

Human beings accomplish the sexual act very fast and also don’t have much in the way of competition. Thus the presence of a baculum is not needed. 

This thus uncovers the enigma of why the baculum became obsolete in human beings over the course of time. Chimps and bonobos have small bacula.

They also have short lengths of intromission during sex. However, they have high competition during the mating season for females. Thus they tend to keep part of the baculum.

After humanity split off from the rest of the primates, it gradually lost its bacula. The last straw that broke the camel’s back as far as the baculum was concerned took place when monogamy became common in the law-lines of culture.

Progress thus demanded some sort of sacrifice and in our case, it was of the baculum. 

Findings of this study got published in the Proceedings of the Royal Society B.

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<a href="/latest_stories/all/all/20" rel="author">Sumayah Aamir</a>
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