Male Vagina
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Male Vagina
relación sexual vaginal; rapport sexuel vaginal; Vaginalni snošaj; sexu harreman baginal; вагинальный секс; Vaginalverkehr; vaginalni seks; вагінальны секс; вагинални секс; Вагинален секс; Vaginalinis seksas; Vaginalni spolni odnos; Pagtatalik na pampuki; Waginalny wobchad; Вагінальны сэкс; الجنس المهبلي; vaginal intercourse; вагінальний секс; vaginale geslachtsgemeenschap; Vaginalni snošaj; вагинални секс; sexo vaginal; seso vajinal; Вагиналды секс; vagina seksumado; ვაგინალური სექსი; vaginal intercourse; Основная разновидность секса; pénétration du pénis en érection dans le vagin; sexual activity typically involving the insertion and thrusting of the penis into the vagina for sexual pleasure, reproduction, or both; sexual activity typically involving the insertion and thrusting of the penis into the vagina for sexual pleasure, reproduction, or both; Geschlechtsverkehr mit Penetration der menschlichen Vagina; сексуальна активність за участі вагіни; seksuele handeling waarbij een man met de penis de vagina van een vrouw penetreert; sexo vaginal; relacion sexual vaginal; rapport vaginal; rapport par voie vaginale; coït vaginal; circlusion; sexu baginal; Вагинальный половой акт; Vaginalni seks; Vaginalsex; Conjunção carnal; vaginal sex; coitus; penile-vaginal intercourse; intromission; vaginal penetration; الجنس_المهبلي; Вагинално проникване; Vaginalinė sueitis
sexual activity typically involving the insertion and thrusting of the penis into the vagina for sexual pleasure, reproduction, or both
Missionary positions (1 t.l., 15 t.t.)
Vaginal creampie (1 t.l., 29 t.t.)
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Sửa đổi lần cuối cùng cách đây 10 tháng bởi Satyricon2 .
Thể loại này gồm 9 thể loại con sau, trên tổng số 9 thể loại con.
129 tập tin sau nằm trong thể loại này, trong tổng số 129 tập tin.
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Systematic Entomology, School of Agriculture, Hokkaido University, Sapporo 060-8589, Japan
Biology Department, Federal University of Lavras, 37200-000 Lavras, MG, Brazil
Department of Biology, Keio University, Yokohama 223-8521, Japan
Natural History Museum of the City of Geneva, CP 6434, 1211 Geneva 6, Switzerland
Open Archive Published: April 17, 2014 DOI: https://doi.org/10.1016/j.cub.2014.03.022
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Females of the cave insect genus Neotrogla have an elaborate penis-like organ
The female penis acts as an intromittent organ and anchors the female to the male
Correlated evolution is detected between the female penis and male genitalia
in: Campbell B.G. Sexual Selection and the Descent of Man, 1871–1971. Aldine Publishing Co ,
Chicago 1972 : 136-179
Harvard University Press ,
Cambridge 1985
Biol. Rev. Camb. Philos. Soc. 2013; 88 : 585-601
Rev. Suisse Zool. 2010; 117 : 611-635
Rev. Suisse Zool. 2013; 120 : 3-12
Rev. Suisse Zool. 2010; 117 : 611-635
Figure 1 Male and Female Genitalia of Prionoglarididae
(B and C) Prionoglaris dactyloides spermathecal duct opening (B; light blue) and phallosome (C).
(D and E) Speleketor irwini , same as in (B) and (C).
(F and G) Neotrogla aurora gynosome (F; parts highlighted as in Figures 2 and 3 ) and phallosome (G). The green arrowhead in (G) indicates the left lateral pouch in the male genital chamber.
Scale bars represent 0.1 mm. See also Figure S1 and Table S2 .
Figure 2 Terminal Structures of Neotrogla curvata
The following parts of the gynosome are highlighted: distal sclerite (light blue); basal rod (orange); and membranous region with dorsal lobe (yellow) and lateral (green), dorsal (red), and ventrolateral (purple) spiny areas. The corresponding male genital pouches are indicated by arrowheads of the same color.
(A) Erect gynosome, dorsolateral view.
(B–E) Terminal abdomens in copula, lateral (B–D), and ventral (E) views. The gynosome tip and seminal duct opening are magnified in (D). In the schematic drawing (C), female structures, except for the distal part of the gynosome, are indicated in orange and male structures in gray.
Scale bars represent 0.1 mm. See also Figure S2 and Table S1 .
Figure 3 Terminal Structures of Neotrogla truncata
Color scheme as in Figure 2 , plus pink color indicating the basal gynosomal membrane.
(A–D) Terminal abdomens in copula, lateral (A–C) and ventral (D) views. (B) shows a schematic drawing. The gynosome tip and seminal duct opening are magnified in (C).
(E) Slide-mounted male genitalia. Green open arrowheads indicate a lack of membranous pouches. See Figure 1 G for comparison.
(F) Spermatheca fixed during copulation. Seven spermatophores are present, of which two attached to the spermathecal plate are filled (indicated by white asterisks); the others are separated from the plate and are empty (black asterisks).
Scale bars represent 0.1 mm. See also Figure S3 and Table S1 .
Faune France. 1998; 83 ( i–xx, 1–517 )
The gynosomal structures are species specific. The distal sclerotized part is strongly curved in N. curvata ( Figures 2 A–2D), but is straight or only slightly curved in other species ( Figures 3 and S2 ). The membranous region of N. curvata has a smooth dorsal lobe (yellow) and five areas bearing sclerotized spines: a dorsal (red), a pair of lateral (green), and a pair of ventrolateral (purple) spiny areas ( Figure 2 ). In N. aurora and N. brasiliensis , the dorsal and lateral spiny areas are present ( Figure S2 ), but the dorsal lobe and ventrolateral spiny areas are absent. The gynosome of N. truncata lacks all elaborations, but its membranous part is densely covered by tiny bristled spines ( Figure 3 ).
Male genitalia are simple, but also species specific, corresponding to the gynosomal structures ( Table S1 ). In N. curvata , the seminal duct is strongly curved, as is the gynosomal apical sclerite ( Figures 2 B–2D), whereas these are straight or only slightly curved in the others ( Figure 3 and S2 ). The male genital chamber of N. aurora , N. brasiliensis , and N. curvata has lateral pouches corresponding to the lateral spiny areas of the gynosome ( Figures 1 G, 2 , S1 B, and S2 , green arrowheads), while ventrolateral spiny areas and corresponding male pouches are only present in N. curvata ( Figures 2 B, 2E, and S1 B, purple arrowheads). During copulation, the spiny areas fit into the corresponding pouches and anchor the female ( Figures 2 and S2 ). The gynosome of N. truncata lacks strong spines ( Figure 3 A and 3D), and the female of this species anchors itself using the entire surface of the bristled gynosomal membrane ( Figure 3 A and 3D). The male genital chamber of this species lacks any pouches ( Figure 3 E, open green arrowheads).
Harvard University Press ,
Cambridge 1985
Biol. Rev. Camb. Philos. Soc. 2013; 88 : 585-601
Behav. Ecol. Sociobiol. 2012; 66 : 1107-1114
Biol. Rev. Camb. Philos. Soc. 2001; 76 : 305-339
in: Leonard J.L. Córdoba-Aguilar A. The Evolution of Primary Sexual Characters in Animals. Oxford University Press ,
Oxford 2010 : 40-78
Trends Ecol. Evol. 2003; 18 : 41-47
Biol. Rev. Camb. Philos. Soc. 2013; 88 : 585-601
Behav. Ecol. Sociobiol. 2012; 66 : 1107-1114
Biol. J. Linn. Soc. Lond. 2011; 102 : 661-668
Entomol. Tidskr. 1969; 90 : 233-271
Princeton University Press ,
Princeton 1975
in: Hall B.K. Olson W.M. Keywords and Concepts in Evolutionary Developmental Biology. Harvard University Press ,
Cambridge 2003 : 218-227
Biol. J. Linn. Soc. Lond. 2005; 85 : 463-469
J. Insect Behav. 1996; 9 : 599-612
Rev. Suisse Zool. 2010; 117 : 611-635
Rev. Suisse Zool. 2013; 120 : 3-12
Annu. Rev. Entomol. 2008; 53 : 83-101
Rev. Suisse Zool. 2010; 117 : 611-635
Zool. Jb. (Anat.). 1956; 75 : 207-286
Faune France. 1998; 83 ( i–xx, 1–517 )
Zool. Jb. (Anat.). 1956; 75 : 207-286
Faune France. 1998; 83 ( i–xx, 1–517 )
Princeton University Press ,
Princeton 1994
in: Campbell B.G. Sexual Selection and the Descent of Man, 1871–1971. Aldine Publishing Co ,
Chicago 1972 : 136-179
Harvard University Press ,
Cambridge 1985
Biol. Rev. Camb. Philos. Soc. 2013; 88 : 585-601
Behav. Ecol. Sociobiol. 2012; 66 : 1107-1114
Biol. Rev. Camb. Philos. Soc. 2001; 76 : 305-339
in: Leonard J.L. Córdoba-Aguilar A. The Evolution of Primary Sexual Characters in Animals. Oxford University Press ,
Oxford 2010 : 40-78
Trends Ecol. Evol. 2003; 18 : 41-47
in: Hall B.K. Olson W.M. Keywords and Concepts in Evolutionary Developmental Biology. Harvard University Press ,
Cambridge 2003 : 218-227
See the Supplemental Information for additional details.
Neotrogla specimens in copula were killed with hot water (∼80°C) and fixed with 80% ethanol in caves. We observed three pairs of N. aurora , four pairs of N. brasiliensis , 11 pairs of N. curvata , and six pairs of N. truncata .
A total of 12 couplings of N. curvata were observed ( Table S2 ). Specimens were kept in Styrofoam boxes during observation. Adults were placed together, and when a couple formed, it was placed in a separate vial for observation. Copulations were observed at 30 min intervals. After copulation, some pairs were kept for observation until they died (n = 2), sometimes in the presence of their F1 nymphs.
We thank F. Pellegatti-Franco for specimens, M. Souza Silva and M. Medeiros for support in the field, E. Magalhães for information concerning the cave locations, M. Villela, M. Michele Perdigão, and L. Faria Ferreira for help with some mating observations, and J. Hollier for discussion and final language editing. This study was supported in part by CNPq grant 301061/2011-4 to R.L.F., JSPS grant 22770058 to Y.K., and JSPS grant 24570093 to K.Y.
Document S1. Figures S1–S3, Tables S1 and S2, and Supplemental Experimental Procedures
The Descent of Man and Selection in Relation to Sex.
Parental investment and sexual selection.
Sexual Selection and Animal Genitalia.
Correlated evolution of male and female morphologles in water striders.
Functions, diversity, and evolution of traumatic mating.
A new genus of Sensitibillini from Brazilian caves (Psocodea: ‘Psocoptera’: Prionoglarididae).
A new species of Neotrogla from Brazilian caves (Psocodea: ‘Psocoptera’: Prionoglarididae).
Correlated evolutionary changes in Drosophila female genitalia reduce the possible infection risk caused by male copulatory wounding.
The evolution of male mate choice in insects: a synthesis of ideas and evidence.
Rapid divergent evolution of genitalia.
Phenotypic engineering unveils the function of genital morphology.
An enigmatic lineage of mites from Baltic amber shows a unique, possibly female-controlled, mating.
Über Bau und Funktion der Kopulationsorgane bei den Cyphones (Col. Helodidae). Studien über die Familie Helodidae X.
The secondary copulatory organ in female ground weta ( Hemiandrus pallitarsis , Orthoptera: Anostostomatidae): a sexually selected device in females?.
The sclerotized spermatophore of the barklouse Lepinotus patruelis .
Mate choice and competition in the barklouse Lepinotus patruelis (Psocoptera: Trogiidae): The effect of diet quality and sex ratio.
Sexual conflict over nuptial gifts in insects.
Zur Konstruktionsmorphologie des männlichen Geschlechtsapparates der Psocopteren.
On the origins of novelty in development and evolution.
Comparative copulation anatomy of the Drosophila melanogaster species complex (Diptera: Drosophilidae).
Received in revised form:
February 12,
2014
Received:
January 7,
2014
© 2014 Elsevier Ltd. Published by Elsevier Inc.
Female Penis, Male Vagina, and Their Correlated Evolution in a Cave Insect
Figure 1 Male and Female Genitalia of Prionoglarididae
Figure 2 Terminal Structures of Neotrogla curvata
Figure 3 Terminal Structures of Neotrogla truncata
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Author:
Lorenzo Crumbie MBBS, BSc
•
Reviewer:
Latitia Kench
Last reviewed: June 27, 2022
Reading time: 12 minutes
There are often many phenotypical differences between males and females of a particular species. These include differences in height, body mass, muscle tone, hair length, and in non-human species, skin or feather pigmentation. The most emphasized difference between the two members of the species is the capability (or lack thereof) to bear offspring.
This difference would subsequently suggest that there would also be a difference between the structure of the male and female genitalia . While the differences between human male and female genitals will inadvertently be mentioned, the true aim of this article is to elucidate the similarities that exist between the two.
As a result, embryological origins, as well as internal and external structures, along with some clinically relevant points, will be explored.
Although the genotypic sex of the individual is determined at the time of fertilization (46 XX or XY), phenotypic expression of sexual dimorphism in humans is subject to a myriad of genetic pathways. Furthermore, even though the end results appear structurally different, there are a lot of similarities between males and females embryologically.
Both ovaries and testes begin as epithelial proliferation and mesenchymal condensation along the caudal segment of the future posterior abdominal wall (anteromedial to the mesonephros). This structure, the genital ridge , is infiltrated by primordial germ cells around the sixth gestational week. The arrival of these cells has been credited with the induction of gonadal differentiation.
Additionally, as the primordial germ cells enter the gonadal ridge, the mesenchyme deep to the ridge is penetrated by the ridge’s proliferating epithelium . They continue to form primitive sex cords , making it impossible to distinguish between male gonads and female gonads at this developmental level. These primitive sex cords continue to form the rete testis in males and are replaced by vascular stroma of the ovarian medulla in females.
Both sexes are equipped with two paired tubular structures known as the paramesonephric (Müllerian) duct and the mesonephric (Wolffian) duct . The former arise anterolaterally, along the length of the urogenital ridge, while the latter is an intermediate mesodermal derivative between the levels of the upper thoracic and the upper lumbar region. The proximal end of the paramesonephric duct opens and communicates with the abdominal cavity while the distal end continues lateral to the mesonephric duct, before crossing it ventrally to course in the midline. In the midline, it approximates with the contralateral paramesonephric duct and subsequently fuses in females to later form the uterine canal (future fallopian tubes and uterus) and paramesonephric tubercle . In males, they degenerate to form the appendix testis .
Some aspects of the proximal part of the mesonephric ducts contribute to the formation of the renal system, while the majority degenerates during foetal life. A part of the distal mesonephric tube pierces the posterior part of the urogenital sinus and contribute to the formation of the seminal vesicle , ductus epididymis, ejaculatory ducts and ductus deferens . In females, these ducts
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