Human sexuality is the way people experience and express themselves sexually. Interest in sexual activity typically increases when an individual reaches puberty. Opinions differ on the origins of an individual’s sexual orientation and sexual behavior. Evolutionary perspectives on human coupling, reproduction and reproduction strategies, and social learning theory provide further views of sexuality. Socio-cultural aspects of sexuality include historical developments and religious beliefs. Human sexuality is driven by genetics and mental activity. Freud believed sexual drives are instinctive.
Psychological theories exist regarding the development and expression of gender differences in human sexuality. As adults, they have different reproductive mechanisms that enable them to perform sexual acts and to reproduce. Men and women react to sexual stimuli in a similar fashion with minor differences. The hypothalamus is the most important part of the brain for sexual functioning. This is a small area at the base of the brain consisting of several groups of nerve cell bodies that receives input from the limbic system.
Studies have shown that within lab animals, destruction of certain areas of the hypothalamus causes the elimination of sexual behavior. Males also have both internal and external genitalia that are responsible for procreation and sexual intercourse. The male genitalia are the penis and the scrotum. The penis provides a passageway for sperm and urine. The penis’s internal structures consist of the shaft, glans, and the root. The shaft of the penis consists of three cylindrical bodies of spongy tissue filled with blood vessels along its length.
Two of these bodies lie side-by-side in the upper portion of the penis called corpora cavernosa. The raised rim at the border of the shaft and glans is called the corona. The urethra runs through the shaft, providing an exit for sperm and urine. Male internal reproductive structures are the testicles, the duct system, the prostate and seminal vesicles, and the Cowper’s gland. The testicles are the male gonads where sperm and male hormones are produced. Millions of sperm are produced daily in several hundred seminiferous tubules.