Why Homo Sapiens or Humans have no Penis Bone: The University College London has proposed a Theory with the Answer

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It is the most diverse bone ever discovered. The length is highly variable and varies to a great extent in different males in all species. Penis Bone, as it is known is considered as a marvel of evolution but it is not found in Human Males. 

A scientific research was initiated by University College London to find out the evolution of Baculum, the scientific nomenclature for Penis Bone. Baculum provides structural support to Penis and hence, it is so diverse across males of different species. 

As per the reports published in The Guardian, Matilda Brindle and Kit Opie of University College London explains the evolution that took place over a timespan of more than 95 million years. As per the research, Baculum went under evolution where it became smaller for some mammals and bigger for some mammals. 

The reason behind 'the existence of Baculum aka Penis Bone is for prolong intromission which is a term used for prolonging penetration so the female counterparts can conceive. It was also important to evade other potential partners that might invade into the relationship. Further, it has been found out that Chimps have the tiniest Baculum of mere human fingernail length. The shortness indicates that male Chimps spend just seven seconds in mating. Chimpanzees experience polygamous mating. 

Independent quoted that ancestors of both carnivores and primates had a baculum, however, it extinct due to less Intromission. To put things into perspective, Nocturnal Lemur has a long baculum. 

Humans are the most developed Homo sapiens. As per the research, the loss of baculum happened because of Monogamy. The term means one mate at the time which drastically reduced the fear of other potential partners mating with the female human, as per a theory. The monogamous relationships between humans date back to more than 1.9 million years ago. Polygamous mating is practiced by today's humans, however, it couldn't have halted the penis bone from being extinct and hence, the humans lost the Penis bone.

Kit Opie was reported saying "We think that is when the human baculum would have disappeared because the mating system changed at that point", Further she added that this phenomenon led the Baculum to diminish and then completely vanish. The detailed research made by Kit Opie and Matilda Brindle at University College London is published in The Royal Society.