Sex chromosomes influence physical differences between male and female animals, such as feather patterns in mandarin ducks. In most animals, sex chromosomes help determine whether an individual develops as a male or female. Sexes of some animals, such as most male arachnids, lack a second sex chromosome entirely. These chromosomes contribute to the physical differences between males and females.
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NCBI Bookshelf. The male sex organs allow men to have children. But they have other important jobs, too: The sex organs produce hormones, control the process of boys maturing into grown men, and make sex and sexual pleasure possible. Like women, men have external and internal sex organs. The external male sex organs include the penis and the scrotum. The main purpose of the external sex organs is to allow for sexual intercourse and sexual pleasure.
Human male sexuality
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Human male sexuality encompasses a wide variety of feelings and behaviors. Men's feelings of attraction may be caused by various physical and social traits of their potential partner. Men's sexual behavior can be affected by many factors, including evolved predispositions , individual personality , upbringing , and culture. While most men are heterosexual , significant minorities are homosexual or varying degrees of bisexual.