RFD GM

Contrary to popular belief, s***m—the cell seeking the egg to reproduce—is not the only component of semen. "Most of the fluid in semen is made up of secretions from male reproductive organs. Semen contains citric acid, free amino acids, fructose, enzymes, phosphorylcholine, prostaglandin, potassium, and zinc," according to News-Medical.

Have you ever wondered why men have ni***es? The short answer is that ni***es develop in the womb before the embryo becomes distinctly male or female, according to Healthline. It turns out men also have mammary glands—the organ responsible for creating milk. Although men can produce milk, it generally only occurs when something is wrong, most commonly an interference with prolactin—the hormone needed to produce milk, according to Scientific American.

We knew men were competitive, but this evolutionary adaptation theory shows just how ingrained that particular edge really might be. A study published by Evolutionary Psychology suggests "the human p***s may have evolved to compete with s***m from males from other species by displacing rival semen from the cervical end of the va**na prior to ej*******on." The shape of the human p***s varies greatly from other species, and this might be why, the study says. To learn about how gender plays a role in coronavirus infections, check out Here's Why Men Die From Coronavirus More Than Women.

This myth has been passed around for many years, but a study published by BJU International decided to put this theory to the test. For the study, "two urologists measured the stretched pe**le length of 104 men and related this to their shoe size." The outcome? There was no scientific correlation between the two body parts.

From as early as 16 weeks old, fetuses have been observed with brief protuberances. While there are not enough studies to assert why this occurs, some point to the age-old "use it or lose it" theory— The Los Angeles Times reported that periodic movements are necessary to help the pe**le tissue stay oxygenated and healthy. For indicators that either you or a man in your life needs to see a doctor, check out 50 Signs of Poor Health Men Should Never Ignore.

While women have a larger hippocampus and prefrontal cortex, which makes them more detail-oriented by nature, men have a large amygdala. Langdon says men's sizable amygdala could be responsible for their stronger ability to process threats. For tips on how to feel your best, check out 100 Easy Ways to Be a Much Healthier Person, According to Science.

This fact is probably unsurprising to anyone who has spent the night beside a loudly snoring man. "Snoring, because it comes from your nose and your mouth—is typically more common in men due to abdominal body fat." The American Academy of Sleep Medicine reported that about 40 percent of men are habitual snorers, while only 24 percent of women are habitual snorers.

What makes a face masculine or feminine? There are actually a couple of tangible factors that contribute to a standard masculine or feminine appearance. Kimberly Langdon, OBGYN, and medical advisor at Medzino Health says, "Men have bigger jawbones, cheeks, and brows while women have wider faces, bigger lips, and higher eyebrows." A study published by Frontiers of Psychology found that eyebrow thickness, jawbone prominence, and face height was a prominent part of masculinity and perceived attractiveness.

One might assume men's teeth would be larger, as they are generally "bigger" human beings. Pia Lieb, DDS, founder of Cosmetic Dentistry Center NYC says this is actually true. She points to studies that found men's teeth do in fact, tend to be larger, than women's—especially the canine teeth. For more information related to oral hygiene, check out This Is What Happens to Your Body When You Don't Floss Your Teeth

If you think you know more blonde-haired women than men, you're probably right. According to Joseph Hart, RN, director of operations at MAXIM Hair Restoration, "Men will typically have darker hair than their female counterparts, particularly once the individual has passed through puberty and this trend will continue with age." Hart says this phenomenon is due to men's higher levels of melanin, which influences people's skin tone, hair color, and eye color.