A report on Penis and Ejaculation

Females have corkscrew vaginas with many blind pockets designed for difficult penetration and to prevent becoming pregnant. This reduced the likelihood of fertilization by unwanted aggressors in favor of fitter mates.

Diagram of the male pelvic and reproductive organs

External male genitalia of a Labrador Retriever

Penises of minke whales on display at the Icelandic Phallological Museum

Genitorinary system of a raccoon (Procyon lotor)

Penis of a human, with pubic hair removed to show anatomical detail

The spine-covered penis of Callosobruchus analis, a bean weevil

A usual precursor to ejaculation is the sexual arousal of the male, leading to the erection of the penis, though not every arousal nor erection leads to ejaculation.

- Ejaculation

The male pronghorn usually ejaculates immediately after intromission.

- Penis

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Three columns of erectile tissue make up most of the volume of the penis.

Erection

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Various erection angle and shape of penises.

An erection (clinically: penile erection or penile tumescence) is a physiological phenomenon in which the penis becomes firm, engorged, and enlarged.

The corpus spongiosum is a single tubular structure located just below the corpora cavernosa, which contains the urethra, through which urine and semen pass during urination and ejaculation respectively.

Stallion

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Male horse that has not been gelded .

Mustang stallion (right) with part of his band of mares and foals

Stallion exhibiting the flehmen response

A stallion's secondary characteristics include heavier muscling for a given breed than is seen in mares or geldings, often with considerable development along the crest of the neck, as shown in this image.

Even well-trained stallions require firm and consistent handling by experienced individuals.

Aggressive and even violent behavior between stallions not habitually living together or in the presence of mares adds to the challenges in stallion management.

Provided with sufficient space and food with no distractions from mares in estrus, even stallions previously used for breeding may coexist peacefully. Not all individuals are suited for this kind of arrangement, however.

Stallions are capable of achieving a high level of discipline and training.

These contribute fluid to the semen at ejaculation, but are not strictly necessary for fertility.

the penis, within the "penile sheath". Stallions have a vascular penis. When non-erect, it is quite flaccid and contained within the sheath. The retractor penis muscle is relatively underdeveloped. Erection and protrusion take place gradually, by the increasing tumescence of the erectile vascular tissue in the corpus cavernosum penis. When not erect, the penis is housed within the prepuce, 50 cm long and 2.5 to 6 cm in diameter with the distal end 15 to 20 cm. The retractor muscle contracts to retract the penis into the sheath and relaxes to allow the penis to extend from the sheath. When erect, the penis doubles in length and thickness and the glans increases by 3 to 4 times. The urethra opens within the urethral fossa, a small pouch at the distal end of the glans. A structure called the urethral process projects beyond the glans.

Sexual arousal

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Sexual arousal (also known as sexual excitement) describes the physiological and psychological responses in preparation for sexual intercourse or when exposed to sexual stimuli.