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.
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.
Men still aren't living as long as women -- and that holds true for humans' primate cousins as well, a new study shows. In the study, researchers looked at data from six populations of humans from both modern and historical times, in different countries. The investigators found that, "in spite of the huge gains in human longevity over the past century, the male-female difference has not shrunk," said Susan Alberts, a professor of biology at Duke University and a co-author of the new study. The researchers did find that the the amount by which women outlived men varied across populations. For instance, the largest male-female difference in life span among the populations studied was in modern-day Russia, where the gap is approximately 10 years.