A man is an adultmalehuman. He is the opposite of a woman. People use the word "man" (one man, two or more men) to talk about gender. Manhood is the period in a male's life after he changes from a boy. A boy is a male child; a female child is called a girl. After boys reach maturity, they can be called a man.
There are also those who identify as a man even though they are not one (they are not a member of the male sex). They are referred to as a man in certain societies.
Biology
Human male reproductive anatomy and surroundings
There are some sexual differences between a man and a woman. Men have sex organs which we call "external" (not inside the body). But many parts of the male reproductive system are internal too. The study of male reproduction and sex organs is "andrology".
Image of a man and a woman with body parts labeled
Men normally have the same illnesses as women, but there are some sexual illnesses which men have only, or more often.
There are more differences between men and women, not only sexual differences.
Some people say men, as a group, are more aggressive than women; they want to fight more. But most research has found that men and women are equally aggressive.
In modern western society, few men wear make-up or clothing of the sort women traditionally wear.
Men are usually taller than women. In 1996, the average height of men around the world was 171 cm.[1]
Biology is not the only thing which makes people feel they are men, or that other people are men. Some people were born in a female body but feel that they are men. We call these transgender or transsexual men.[2] Some men can have a hormone or chromosomal difference. Some men have other intersex conditions. Some of those intersex people who people said were female (girls) when they were born want to change this later in their lives.[3]
