Understanding male sexual organs.

Bladder - This is where urine is stored.
Ejaculatory duct - Takes semen from the seminal vesicle to the penis during ejaculation.
Epididymis - A place where spermatozoa are stored after production in the testicles.
Foreskin - The piece of skin which covers the penis and slides back when it becomes erect. Circumcised men will have had their foreskin either partially or fully removed.
Frenulum - A piece of skin which joins the bottom of the glans to the foreskin.
Glans - The bell-shaped end of the penis which is full of nerve endings. When stimulated the glans produces sexual pleasure.
Penis - The tube of flesh that a male urinates through and that fills with blood and becomes stiff during an erection.
Prostate gland - A gland which produces a liquid that goes into semen, it's also stimulated during anal sex.
Scrotum - The sack of skin which contains the testicles.
Seminal vesicle - Produces most of the fluid that makes up semen.
Testicles - Glands which produce spermatozoa which are stored in the epididimys and mixed with fluid from the seminal vesicle and prostate to produce semen.
Urethral opening - Urine passes from the bladder, down the urethra and out of the urethral opening when a male urinates, semen also leaves the body here when a male ejaculates.
Vas Deferens - The tube which takes spermatozoa from the testicles to the seminal vesicle.