Sex organ

The sex organs of a green algae Chara are the male antheridia (red) and female archegonia (brown).
The female genitalia of Lepidoptera

Any part of an animal or plant that is involved in sexual reproduction.

- Sex organ
The sex organs of a green algae Chara are the male antheridia (red) and female archegonia (brown).

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Mallard pseudo-penis

Penis

Mallard pseudo-penis
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.
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 penis (plural penises or penes ) is the primary sexual organ that male animals use to inseminate females (or hermaphrodites) during copulation.

Vulvas of different women (pubic hair removed in some cases)

Vulva

Vulvas of different women (pubic hair removed in some cases)
Labeled image of a vulva, showing external and internal views
Vulva with visible parts of the clitoris and the parts lying under the skin
Muscles underlying the vulva and perineum
The length of the labia minora varies significantly between women: while the labia majora completely enclose the labia minora in some women (top row), in other women they protrude and are clearly visible in upright standing position (bottom row). Colloquially, these variations of the labia are also referred to as "innies" and "outies".
Genital tubercle of female at fourteen weeks
Development of genitals showing homologues from indifferent at A to both sexes - female on right
Development of genitals showing homologues from indifferent to both sexes
Non-aroused vulva on the left and a sexually aroused vulva on the right with enlarged and shiny labia minora from vaginal lubrication and vasocongestion
Water warts of molluscum contagiosum
Pubic hair with crab lice
The Labia pride movement resents the ideals of female cosmetic genital surgeries: The Muff March in London, 2011
Female genital piercings include the Nefertiti piercing central and the Christina piercing pictured on either side
Derived from traditional symbols, Hanabira scarification is intended to decorate the pubic area
A gynaecological examination being carried out in 1822
Japanese artist Megumi Igarashi with vulva portrayal
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Glans clitoris with small distance to the opening
Glans clitoris with medium distance to the opening
Lack of contact of the clitoral glans with the penis
Contact of the clitoral glans with the penis with small CUMD
Classification of the 200 women into CUMD categories
Selection of women studied and interviewed
Vulva handsign used as a yogic mudra
Attic red-figure lid. Three female organs and a winged phallus.
Yoni at Mahadev temple
Glans clitoris with medium distance to the opening

The vulva (plural: vulvas or vulvae; derived from Latin for wrapper or covering) consists of the external female sex organs.

A pair of ovaries of Cyprinus carpio (common carp) placed in dissecting dish

Gonad

Mixed gland that produces the gametes and sex hormones of an organism.

Mixed gland that produces the gametes and sex hormones of an organism.

A pair of ovaries of Cyprinus carpio (common carp) placed in dissecting dish

Gonads start developing as a common primordium (an organ in the earliest stage of development), in the form of gonadal ridges, and only later are differentiated to male or female sex organs.

The internal anatomy of the human vulva, with the clitoral hood and labia minora indicated as lines. The clitoris extends from the visible portion to a point below the pubic bone.

Clitoris

The internal anatomy of the human vulva, with the clitoral hood and labia minora indicated as lines. The clitoris extends from the visible portion to a point below the pubic bone.
Stages in the development of the clitoris
Created by Helen O'Connell using MRI, the first 3D image of a clitoris in an erect state with the adjacent organs of the uterus and urinary bladder
Clitoris; deep dissection
A partially exposed clitoral glans, which can't be fully exposed due to a mild case of adhesions to the clitoral hood
Structures of the vulva, including external and internal parts of the clitoris
The clitoral hood has a normal anatomical variation in size and appearance in different adult women: while it is completely covered by the labia majora in some women, standing with their legs closed, in others it is pronounced and clearly visible.
Clitoral hood (1) and clitoris (2). Labia are spread apart on the bottom image.
An enlarged clitoris due to clitoromegaly
De re anatomica
A Georg Ludwig Kobelt illustration of the anatomy of the clitoris
Girl protesting for clitoris-awareness at a women's rights rally in Paris, 2019
With a urogenital system in which the female urinates, mates and gives birth via an enlarged, erectile clitoris, female spotted hyenas are the only female mammals devoid of an external vaginal opening.
Male and female reproductive systems of the spotted hyena, from Schmotzer & Zimmerman, Anatomischer Anzeiger (1922). Abb. 1 (Fig. 1.) Male reproductive anatomy. Abb. 2 (Fig. 2.) Female reproductive anatomy. Principal abbreviations (from Schmotzer & Zimmerman) are: T, testis; Vd, vas deferens; BU, urethral bulb; Ur, urethra; R, rectum; P, penis; S, scrotum; O, ovary; FT, tuba Fallopii; RL, ligament uteri; Ut, uterus; CC, Corpus clitoris. Remaining abbreviations, in alphabetical order, are: AG, parotid analis; B, vesica urinaria; CG, parotid Cowperi; CP, Corpus penis; CS, corpus spongiosum; GC, glans; GP, glans penis; LA, levator ani muscle; Pr, prepuce; RC, musculus retractor clitoris; RP, Musculus retractor penis; UCG, Canalis urogenital.

The clitoris ( or ) is a female sex organ present in mammals, ostriches and a limited number of other animals.

In the first stage of sexual reproduction, "meiosis", the number of chromosomes is reduced from a diploid number (2n) to a haploid number (n). During "fertilisation", haploid gametes come together to form a diploid zygote, and the original number of chromosomes is restored.

Sexual reproduction

Type of reproduction that involves a complex life cycle in which a gamete with a single set of chromosomes (haploid) combines with another to produce a zygote that develops into an organism composed of cells with two sets of chromosomes (diploid).

Type of reproduction that involves a complex life cycle in which a gamete with a single set of chromosomes (haploid) combines with another to produce a zygote that develops into an organism composed of cells with two sets of chromosomes (diploid).

In the first stage of sexual reproduction, "meiosis", the number of chromosomes is reduced from a diploid number (2n) to a haploid number (n). During "fertilisation", haploid gametes come together to form a diploid zygote, and the original number of chromosomes is restored.
An Australian emperor dragonfly laying eggs, guarded by a male
Flowers contain the sexual organs of flowering plants.
Puffballs emitting spores

Dimorphism is found in both sex organs and in secondary sex characteristics, body size, physical strength and morphology, biological ornamentation, behavior and other bodily traits.

The ventral side (underside) of a female American lobster, a member of the class Malacostraca. The gonopores are at the bases of the third walking leg, pointing towards the animal's tail.

Gonopore

The ventral side (underside) of a female American lobster, a member of the class Malacostraca. The gonopores are at the bases of the third walking leg, pointing towards the animal's tail.

A gonopore, sometimes called a gonadopore, is a genital pore in many invertebrates.

A peacock displays his long, colored tail, an example of secondary sex characteristics.

Secondary sex characteristic

Secondary sex characteristics are features that appear during puberty in humans, and at sexual maturity in other animals.

Secondary sex characteristics are features that appear during puberty in humans, and at sexual maturity in other animals.

A peacock displays his long, colored tail, an example of secondary sex characteristics.
A red deer stag's antlers are secondary sexual characteristics.
Anatomical characteristics of the human male and female

These characteristics are particularly evident in the sexually dimorphic phenotypic traits that distinguish the sexes of a species, but unlike the sex organs (primary sex characteristics), are not directly part of the reproductive system.

Diagram of the scrotum. On the left side the cavity of the tunica vaginalis has been opened; on the right side only the layers superficial to the Cremaster muscle have been removed.

Scrotum

Anatomical male reproductive structure located at the base of the penis that consists of a suspended dual-chambered sac of skin and smooth muscle.

Anatomical male reproductive structure located at the base of the penis that consists of a suspended dual-chambered sac of skin and smooth muscle.

Diagram of the scrotum. On the left side the cavity of the tunica vaginalis has been opened; on the right side only the layers superficial to the Cremaster muscle have been removed.
Image showing musculature and inner workings of the scrotum.
Stages in the development of the male external genitalia.
Human scrotum in a relaxed state (left) and a tense state (right)

Male sex hormones are secreted by the testes later in embryonic life to cause the development of secondary sex organs.

Stamens of a Hippeastrum with white filaments and prominent anthers carrying pollen

Stamen

Stamens of a Hippeastrum with white filaments and prominent anthers carrying pollen
Hippeastrum flowers showing stamens above the style (with its terminal stigma)
Closeup of stamens and stigma of Lilium 'Stargazer'
Stamens, with distal anther attached to the filament stalk, in context of floral anatomy
Cross section of a Lilium stamen, with four locules surrounded by the tapetum
Stamen with pollinia and its anther cap. Phalaenopsis orchid.

The stamen (plural stamina or stamens) is the pollen-producing reproductive organ of a flower.

The principle of homology: The biological relationships (shown by colours) of the bones in the forelimbs of vertebrates were used by Charles Darwin as an argument in favor of evolution.

Homology (biology)

Similarity due to shared ancestry between a pair of structures or genes in different taxa.

Similarity due to shared ancestry between a pair of structures or genes in different taxa.

The principle of homology: The biological relationships (shown by colours) of the bones in the forelimbs of vertebrates were used by Charles Darwin as an argument in favor of evolution.
Pierre Belon systematically compared the skeletons of birds and humans in his Book of Birds (1555).
Sycamore maple fruits have wings analogous but not homologous to an insect's wings.
pax6 alterations result in similar changes to eye morphology and function across a wide range of taxa.
Hox genes in arthropod segmentation
The ABC model of flower development. Class A genes affect sepals and petals, class B genes affect petals and stamens, class C genes affect stamens and carpels. In two specific whorls of the floral meristem, each class of organ identity genes is switched on.
The Cretaceous snake Pachyrhachis problematicus had hind legs (circled).
A multiple sequence alignment of mammalian histone H1 proteins. Alignment positions conserved across all five species analysed are highlighted in grey. Positions with conservative, semi-conservative, and non-conservative amino acid replacements are indicated.
Dominance hierarchy behaviour, as in these weeper capuchin monkeys, may be homologous across the primates.
One pinnate leaf of European ash
Detail of palm leaf
Leaf petioles adapted as spines in Fouquieria splendens
The very large leaves of the banana, Musa acuminata
Succulent water storage leaf of Aloe
Insect-trapping leaf of Venus flytrap
Insect-trapping leaf of pitcher plant
Food storage leaves in an onion bulb
The Cretaceous snake Pachyrhachis problematicus had hind legs (circled).

Male and female reproductive organs are homologous if they develop from the same embryonic tissue, as do the ovaries and testicles of mammals including humans.