Humans have a much longer and wider penis than the other great apes. Even the largest of gorillas, more than twice as heavy as a human, will have a penis just two and half inches long when erect. A chimpanzee's testes weigh more than a third of its brain while ours weigh in at less than 3%. The relative size of our penis and testes is all down to our mating strategies, and can provide some surprising insights into early human culture. Primates exhibit all sorts of mating behaviour, including monogamous, polygynous – where males have multiple mates – and multimale-multifemale.
Most people would count getting married as one of the most romantic steps a couple can take. A wedding day marks the special bond between two people, marking a promise to share their lives together. But the root of marriage can be traced back to nothing more romantic than avoiding sexually transmitted diseases, a new study has revealed. Monogamy is a trait present in just three per cent of mammal species, and for a long time scientists have wondered why it evolved in humans. Now a study shows monogamy emerged in early farmers after'sleeping around', which had been the norm among hunter gatherers, became too risky because of genital herpes and other diseases.
The idea that monogamy is'the only way' has long been ingrained in Western culture. While scientists have questioned whether this way of life truly is better than non-monogamy, they've yet to reach a consensus – and, new research argues that this is because even scientists have upheld an'invisible' bias on the subject. In the study, researchers reviewed of several earlier works and surveyed more than 2,000 people, and found that non-monogamous relationships are just as'functional' as traditional ones. While scientists have questioned whether this way of life truly is better than non-monogamy, they've yet to reach a consensus – and, new research argues that this is because even scientists have upheld an'invisible' bias on the subject. Of the group surveyed in the new study from the University of Michigan, 617 participants were in consensual non-monogamous (CNM) relationships, according to Quartz.