"Sexual dimorphism" is the scientific term for physical differences between males and females of a species. Many extreme examples exist: Peacocks far outclass peahens, for instance, while female anglerfish both outsize and outwit their tiny, rudimentary, parasitic male counterparts.
Unlike those animals, men and women are more physically similar than we are different. Nonetheless, there are a few key distinctions in our physiques. Some of them are designed to suit each sex for the role it plays in reproduction, while others exist to help us tell each other apart and to aid in our mutual attraction