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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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.

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.

A newborn joey suckles from a teat found within its mother's pouch

Reproductive system

A newborn joey suckles from a teat found within its mother's pouch
Didactic model of a mammal urogenital system.
A male common frog in nuptial colors waiting for more females to come in a mass of spawn

The reproductive system of an organism, also known as the genital system, is the biological system made up of all the anatomical organs involved in sexual reproduction.

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.

The life cycle of sexually reproducing organisms cycles through haploid and diploid stages

Sex

Trait that determines whether a sexually reproducing animal or plant produces male gametes or female ones.

Trait that determines whether a sexually reproducing animal or plant produces male gametes or female ones.

The life cycle of sexually reproducing organisms cycles through haploid and diploid stages
Hoverflies mating
Flowers contain the sexual organs of flowering plants, usually containing both male and female parts.
Mushrooms are produced as part of fungal sexual reproduction
Sex helps the spread of advantageous traits through recombination. The diagrams compare the evolution of allele frequency in a sexual population (top) and an asexual population (bottom). The vertical axis shows frequency and the horizontal axis shows time. The alleles a/A and b/B occur at random. The advantageous alleles A and B, arising independently, can be rapidly combined by sexual reproduction into the most advantageous combination AB. Asexual reproduction takes longer to achieve this combination because it can only produce AB if A arises in an individual which already has B or vice versa.
Like humans and most other mammals, the common fruit fly has an XY sex-determination system.
Clownfishes are initially male; the largest fish in a group becomes female
Common pheasants are sexually dimorphic in both size and appearance.

In many other terrestrial animals, males use specialized sex organs to assist the transport of sperm—these male sex organs are called intromittent organs.

Differentiation of the male and female reproductive systems does not occur until the fetal period of development.

Sexual differentiation

Process of development of the sex differences between males and females from an undifferentiated zygote.

Process of development of the sex differences between males and females from an undifferentiated zygote.

Differentiation of the male and female reproductive systems does not occur until the fetal period of development.
The Human Y Chromosome showing the SRY gene which codes for a protein regulating sexual differentiation.

The differentiation of other parts of the body than the sex organ creates the secondary sex characteristics.

Sexual selection creates colourful differences between sexes (sexual dimorphism) in Goldie's bird-of-paradise. Male above; female below. Painting by John Gerrard Keulemans

Sexual selection

Mode of natural selection in which members of one biological sex choose mates of the other sex to mate with , and compete with members of the same sex for access to members of the opposite sex (intrasexual selection).

Mode of natural selection in which members of one biological sex choose mates of the other sex to mate with , and compete with members of the same sex for access to members of the opposite sex (intrasexual selection).

Sexual selection creates colourful differences between sexes (sexual dimorphism) in Goldie's bird-of-paradise. Male above; female below. Painting by John Gerrard Keulemans
Victorian cartoonists mocked Darwin's ideas about display in sexual selection. Here he is fascinated by the apparent steatopygia in the latest fashion.
Sexual selection protected flour beetles from extinction in a ten-year experiment.
Male long-tailed widowbird
The peacock tail in flight, the proposed classic example of a Fisherian runaway
The enormous sexually-selected antlers of the Irish elk might have helped it on its way to extinction.
Male mountain gorilla, a species with very large males
Protarchaeopteryx was flightless, but had feathers, perhaps used in courtship, that pre-adapted it for flight.
Among mammals, the male gorilla is much larger than female.
Males of many spiders, such as this Phidippus putnami, have elaborate courtship displays.
A male Abedus indentatus belostomatid bug carries eggs on its back.
Each firefly species attracts mates with its own flash pattern.
Male Dendropsophus microcephalus calling
upright|Territorial fight in the Indian rat snake, Ptyas mucosa
upright |Male Victoria's riflebird displaying to a female
A male satin bowerbird guards its bower from rival males in the hope of attracting females with its decorations.
right|Male southern elephant seals fighting on Macquarie Island for the right to mate
Citronella flower's symmetry may have been subject to sexual selection by its pollinators.

Or it may do the opposite, driving species divergence—sometimes through elaborate changes in genitalia —such that new species emerge.

Labia minora (inner labia) are vertical folds of skin in the very middle of the vulva (external female genitals) between rounded thicker labia majora (the outer labia).

Labia

Labia minora (inner labia) are vertical folds of skin in the very middle of the vulva (external female genitals) between rounded thicker labia majora (the outer labia).
Left: In their resting state, the labia protect the inner areas of the vulva.
Right: Spreading the labia apart exposes inner areas of the vulva.
 A) Anterior commissure of labia majora
 B) Clitoral hood
 C) Labia minora
 D) Labia majora
 E) Posterior commissure of labia majora
 F) Clitoral glans
 G) Inner surface of labia majora
 H) Vulvar vestibule
 I) Urethra
 J) Vaginal orifice
 K) Fourchette
Close up of vagina with the labia minora exposed
Stages in the development of the female genitals
Illustration of the Tanner scale for females, which is a scale for tracking physical changes that occur during puberty. Progression of pubic hair growth can be seen on the right.
An aroused labia with wrinkles similar to those on a male's scrotum.
Left: A vulva in the resting, unaroused state.
Right: The woman is sexually aroused, causing the inner and outer labia to swell, the labia majora to recede slightly, and the vulva to become lubricated.
Labia with pubic hair
Labia without pubic hair
Outer anatomy of clitoris.
Organs of the female reproductive system.
Median sagittal section of female pelvis.
Labia with pubic hair

The labia are part of the female genitalia; they are the major externally visible portions of the vulva.

Flowers or clusters of flowers produced by twelve species of Angiosperms from different families.

Flower

Reproductive structure found in flowering plants .

Reproductive structure found in flowering plants .

Flowers or clusters of flowers produced by twelve species of Angiosperms from different families.
Selection of differently constructed flowers at different stages of vascular plant development
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Reproductive parts of Easter Lily (Lilium longiflorum). 1. Stigma, 2. Style, 3. Stamens, 4. Filament, 5. Petal
The calla lily is not a single flower. It is actually an inflorescence of tiny flowers pressed together on a central stalk that is surrounded by a large petal-like bract.
The ABC model of flower development
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Clianthus puniceus, the Kaka Beak.
A floral diagram, with the pollen tube labelled PG
The fruit of a peach with the seed or stone inside.
Archaefructus liaoningensis, one of the earliest known flowering plants
Amborella trichopoda may have characteristic features of the earliest flowering plants
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Lilies are often used to denote life or resurrection
Flowers are common subjects of still life paintings, such as this one by Ambrosius Bosschaert the Elder
Chancel flowers, placed upon the altar of St. Arsatius's Church in Ilmmünster.
A woman spreading flowers over a lingam in a temple in Varanasi
View of the Tampere Central Square during the Tampere Floral Festival in July 2007.
Flower market – Detroit's Eastern Market

Flowers within art are also representative of the female genitalia, as seen in the works of artists such as Georgia O'Keeffe, Imogen Cunningham, Veronica Ruiz de Velasco, and Judy Chicago, and in fact in Asian and western classical art.