“Why Men Have Nipples”

男性身材高、四肢长、脂肪少、肌肉多、骨质密、红血球多、髋部窄……女性还更容易前十字韧带撕裂……太嫉妒了好吗（￣へ￣）
“Among the physical differences between the sexes, men are generally heavier and taller and have longer arms and legs relative to their height, as well as bigger hearts and lungs. Men are twice as likely to be left-handed as women—an athletic asset in a number of sports.* Men have less fat, denser bones, more oxygen-carrying red blood cells, heavier skeletons that can support more muscle, and narrower hips, which makes running more efficient and decreases the chance of injury—like ACL tears, which are epidemic in female athletes—while running and jumping. “Because they have a broader pelvis, women have a greater angle to their knee,” says Bruce Latimer, professor of anthropology and anatomy at Case Western Reserve University. “So they waste a lot of energy that goes into compression in the hip joint and it doesn’t help you move forward.... The broader the pelvis, the more wasted energy.
One of the most pronounced physical differences between the sexes is in muscle mass. Men pack more muscle fibers into any given space in the body and have 80 percent more muscle mass in their upper body than women, and 50 percent more in their legs. As far as upper body strength, this translates to a three-standard-deviation difference in strength. That is, again, of a thousand men off the street, 997 would have a stronger upper body than the average woman.