A man’s reproductive system includes the testes, two oval-shaped structures in which sperm, a man’s reproductive cells, are produced.
Leading from each testicle is the vas deferens, a tube that carries sperm to the urethra, a channel in the penis that transports urine and sperm.
During ejaculation, each vas deferens propels sperm through the seminal vesicles and the prostate gland, structures that provide liquid nourishment and transport for the sperm.
Now called semen, this combination of sperm and supporting fluids continues its journey through the urethra and is ejected out of the penis.
During intercourse, the semen passes into a woman’s reproductive system where the sperm can meet and fertilize an egg.