All men had a penis with studs

As scientists discovered in the course of the evolution of man lost his thorns in his penis. This allowed him to get real pleasure from sex.

Once all the stronger sex on penis   We had special keratin spines, which today can be found on the penis chimpanzees or mice. That is the conclusion reached by researchers. But in the process evolution of man   I lost these thorns, which led to a greater duration of sexual intercourse, and much more pleasure from it.

Scientists also believe that the disappearance of thorns with penis strengthened monogamous relationship. Men began to receive pleasure from sex that made them stick to favorite partners. Another key step   the evolution of man   It was the development of a larger brain. Alas, it is not only made people smarter, but also led to a greater number of cases of brain tumors.

Spikes are usually present in the penises   those animals in which the process of copulation takes very little time. For example, a male chimpanzee, forced to compete with each other for the right fertilization one or two females. These spikes are composed of a protein called keratin, which is also found in fingernails. In most keratin fits sensory receptors, so that if it is removed, the copulation theoretically should last longer.

It happened in the course of evolution   men who have lost keratin spikes on penis . The disappearance of the spikes are believed by scientists from Stanford University in California, has also made a monogamous relationship more attractive. These studies are published in the magazine Nature.

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