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The term man is usually reserved for an adult male, with the term boy being the usual term for a male child or adolescent.
However, the term man is also sometimes used to identify a male human, regardless of age, as in phrases such as "men's basketball".
There are also transgender and transsexual men, who were assigned as female at birth, but identify as men; there are varying social, legal and individual definitions with regard to these issues.
(See trans man.) The male sex organs are part of the reproductive system, consisting of the penis, testicles, vas deferens, and the prostate gland.
In the mid-twentieth century United States, for example, John Wayne might embody one form of masculinity, while Albert Einstein might be seen as masculine, but not in the same "hegemonic" fashion.
Anthropology has shown that masculinity itself has social status, just like wealth, race and social class.
In mammals, the hormones that influence sexual differentiation and development are androgens (mainly testosterone), which stimulate later development of the ovary.
Secondary sexual characteristics include everything from the specialized male and female features of the genital tract, to the brilliant plumage of male birds or facial hair of humans, to behavioral features such as courtship.
According to Tacitus, the mythological progenitor of the Germanic tribes was called Mannus.
*Manus in Indo-European mythology was the first man, see Mannus, Manu (Hinduism).
The concept of fatherhood and family exists in human societies.
The study of male reproduction and associated organs is called andrology.