In its common usage, it means sexual desire; however, more technical definitions, such as those found in the work of Carl Jung, are more general, referring to libido as the free creative—or psychic—energy an individual has to put toward personal development, or individuation. These tubes, called the seminiferous tubules, house the germ cells that hormones — including testosteronethe male sex hormone — cause to turn into sperm. Once the sperm are produced, they moved from the seminiferous tubules into the rete testis for further maturation. The offspring are more resistant to pathogens as a result, and therefore have an evolutionary advantage," Milinski explains. The tunica albuginea helps trap the blood in the corpora cavernosa, thereby sustaining erection. Semen, which contains sperm, is expelled ejaculated through the end of the penis when the man reaches sexual climax orgasm. Condoms are used to prevent pregnancy, transmission of sexually transmitted diseases STDs - such as gonorrhea, syphilis, and HIVor both.
Human Physiology/The male reproductive system
The sperm is the main reproductive cell in males. They are responsible for secreting the male sex hormones i. The bulbourethral glands also called Cowper's glands are located below the prostate gland and empty into the urethra. When muscles in the penis contract to stop the inflow of blood and open outflow channels, erection is reversed. Ejaculation is the term used when sperm is forced out of the urethra and the penis. It constantly supplies your body with sperm able to travel through the…. Seminal plasma is produced by contributions from the seminal vesicle, prostate, and bulbourethral glands.