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A close-up of a person writing with a silver pen on a small spiral notebook placed on a wooden table. One hand holds the pen while the other hand points to the paper. The writing is blurred and not readable.

Diagram of the male penis showing detailed anatomy, including blood vessels, arteries, and labeled sections such as the dorsal artery, bulb, glans, corpus spongiosum, and corpus cavernosum.

What is the Penis?

The penis is the primary sexual organ that male animals use to inseminate females during sexual intercourse. Learn more about this male genital organ in this primer.

Male Reproductive System

Cross-sectional diagrams of female and male pelvic anatomy, showing the ureter, bladder, and urethra. Labels indicate differences in the urinary systems between sexes.

The urethra is a tube that connects the bladder to the urinary opening for the removal of urine from the body of both females and males, and the conduit in men for semen during sexual intercourse. This primer provides details about this tube.

Male Reproductive System

A simplified, colorful illustration of a neuron showing a round cell body with a purple and blue nucleus at the top and a segmented axon extending downward.

What is the Acrosome Reaction?

In order to initiate fertilization, a sperm must first fuse with the plasma membrane of the female egg cell (known as the zona pellucida) and then penetrate through the membrane to fertilize it. In order to accomplish this, sperm cells go through a proce

Male Reproductive System

Diagram showing three stages of scrotum anatomy: external view with raphe, muscle layer with scrotal septum and muscles, and deep tissues with labeled blood vessels, nerves, ductus deferens, epididymis, and testis.

What is the Scrotum?

The scrotum is a feature of the male reproductive system that hangs from the body at the front of the pelvis, between the legs. Learn more about this multi-layered structure that houses key components of the male reproductive system in this primer.

Male Reproductive System

Diagram illustrating the pituitary gland in the brain releasing hormones into the bloodstream, which then signal the adrenal gland, testicle, and ovary to produce testosterone and estrogen. Red arrows indicate the flow of signals.

Hormonal & Non-hormonal Contraception Primer

Male Contraceptive Initiative provides funding and advocacy support for the development of non-hormonal, reversible forms of male contraception. But what does “non-hormonal” mean? How do these methods differ from “hormonal” contraceptives? This primer pro

A simple illustration of a sperm cell and an egg cell separated by a diagonal line, on a light blue background, symbolizing contraception or prevention of fertilization.

Fertilization – Mechanisms of Male Contraception

The human reproductive system is a complex set of intertwining factors, many of which are required for sustained fertility. By interrupting even a single one of these required processes, we can find...

Male Reproductive System

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