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Since sperm that enters a woman's uterus and then fallopian tubes goes on to fertilize an egg which develops into a fetus or child, the male reproductive system plays no necessary role during the gestation.
The concept of fatherhood and family exists in human societies.
Persons whose anatomy or chromosomal makeup differ from this pattern are referred to as intersex.
This is referred to as the XY sex-determination system and is typical of most mammals, but quite a few other sex-determination systems exist, including some that are non-genetic.
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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.
In the sexually undifferentiated embryo, testosterone stimulates the development of the Wolffian ducts, the penis, and closure of the labioscrotal folds into the scrotum.
However, the term man is also sometimes used to identify a male human, regardless of age, as in phrases such as "men's basketball".
During puberty, hormones which stimulate androgen production result in the development of secondary sexual characteristics, thus exhibiting greater differences between the sexes.
However, there are exceptions to the above for some transgender and intersex men.
*Manus in Indo-European mythology was the first man, see Mannus, Manu (Hinduism).
The term manhood is used to describe the period in a human male's life after he has transitioned from boyhood, having passed through puberty, usually having attained male secondary sexual characteristics, and symbolises a male's coming of age. In English-speaking countries, many other words can also be used to mean an adult male such as guy, dude, buddy, bloke, fellow, chap and sometimes boy or lad.
The closely related Old English pronoun man was used just as it is in Modern German to designate "one" (e. The Old English form is derived from Proto-Germanic *mannz, "human being, person", which is also the etymon of German Mann "man, husband" and man "one" (pronoun), Old Norse maðr, and Gothic manna.