Human beings are sexual throughout life. Sexuality encompasses more than sexual behavior - it is not only the physical, but the mental and spiritual as well. Sexuality is a core component of personality and a fundamental part of human life.
The human reproductive system usually involves internal fertilization by sexual intercourse. In this process, the male inserts his penis into the female 's vagina and ejaculates semenwhich contains sperm. A small proportion of the sperm pass through the cervix into the uterus, and then into the Fallopian tubes for fertilization of the ovum.
As HIV can be transmitted sexually, youth need to understand their sexual anatomy and different types of sexual activity. Female sexual and reproductive organs include in alphabetical order :. Male sexual and reproductive organs include in alphabetical order :.
As animals became more complex, specific organs and organ systems developed to support specific functions for the organism. The reproductive structures that evolved in land animals allow males and females to mate, fertilize internally, and support the growth and development of offspring. The reproductive tissues of male and female humans develop similarly in utero until a low level of the hormone testosterone is released from male gonads.
As one young couple settles down to start a family, learn how biological and evolutionary forces conspire to keep the human race running. Our bodies work in specific, subtle ways for one reason only: making more humans. Travel inside the body to see what happens to both men and women when attraction occurs and when orgasm finally ensures the possibility of replicating ourselves.
Quirks of Human Anatomy by Lewis I. Held, Jr. One example per species is used for illustration, with samples of other sex-limited traits listed in "gene pools" below cf.
In humans, male sex cells or spermatozoa sperm cellsare relatively motile. Female sex cells, called ova or eggs, are non-motile and much larger in comparison to the male gamete. Male and female sex cells are dramatically different from one another in size and shape.
In men and women sexual arousal culminates in orgasm, with female orgasm solely from sexual intercourse often regarded as a unique feature of human sexuality. However, orgasm from sexual intercourse occurs more reliably in men than in women likely reflecting the different types of physical stimulation men and women require for orgasm. In men, orgasms are under strong selective pressure as orgasms are coupled with ejaculation and thus contribute to male reproductive success.
The female reproductive system functions to produce gametes and reproductive hormones, just like the male reproductive system; however, it also has the additional task of supporting the developing fetus and delivering it to the outside world. Unlike its male counterpart, the female reproductive system is located primarily inside the pelvic cavity Figure 1. Recall that the ovaries are the female gonads.
Being knowledgeable about anatomy and physiology increases our potential for pleasure, physical and psychological health, and life satisfaction. Beyond personal curiosity, thoughtful discussions about anatomy and physiology with sexual partners reduces the potential for miscommunication, unintended pregnancies, sexually transmitted infections, and sexual dysfunctions. Lastly, and most importantly, an appreciation of both the biological and psychological motivating forces behind sexual curiosity, desire, and the capacities of our brains can enhance the health of relationships.