[Video] Why are there wrinkles in the vagina? Does it feel better when a man inserts his penis?

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femalesvaginalAs a reproductive and sexual organ, its internal wall structure is complex and has diverse functions. Among them, the vaginal folds (also known as vaginal folds or...)vaginal rugaeThese are transverse or longitudinal folds formed in the mucosal layer, and these structures have been extensively studied in medicine.

As early as ancient Greece, physicians such as Hippocrates began to describe the anatomy of the female reproductive system, but systematic anatomical studies did not begin until the Renaissance.

Furthermore, the popular notion of "famous vaginas," suggesting that certain vaginas, due to their folds, tightness, or other characteristics, can provide extraordinary sexual pleasure, adds a cultural and social dimension to the discussion. These issues not only involve anatomy and physiology but also touch upon evolutionary biology, sexual psychology, and cultural anthropology.

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Overview of the vagina

The vagina is a tubular organ, about 7-10 cm long, connecting the cervix to the vulva. Its inner wall consists of a mucosal layer, a muscular layer, and a fibrous layer. The mucosal layer is rich in folds, which are arranged transversely and can stretch like an accordion. The anterior and posterior walls each have longitudinal columns from which secondary folds extend.

The vaginal wall is not smooth, but rather covered with transverse folds, known as vaginal folds. These structures are mainly concentrated in the lower two-thirds of the vagina, while the upper third is relatively flat. Anatomically, the folds are composed of epithelium, connective tissue, and blood vessels, presenting an "H"-shaped cross-section, which enhances the vagina's ability to expand. From an embryonic developmental perspective, the vagina originates from the fusion of the Müllerian ducts and the urogenital sinus, and matures after puberty under the influence of estrogen.

The formation of vaginal folds is primarily related to hormonal regulation; estrogen promotes thickening of the mucous membrane, leading to the formation of folds. These folds function to expand, provide lubrication, and enhance sensation. During intercourse, these folds may increase friction, thereby enhancing male pleasure.

In addition, vaginal folds are more pronounced in women who have never given birth than in women who have given birth multiple times.

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History of research on vaginal folds

Time period	event	Contributors	significance
Ancient Egypt (1500 BC)	Ebers Papyrus describes the vagina	Unknown doctor	Earliest medical records
Ancient Greece (400 BC)	Hippocrates' description of female anatomy	Hippocrates	Viewing the vagina as an inverted male organ
Renaissance (1500s)	First anatomical drawing	Andreas Vesalius	Detailed vaginal structure
1844	Critoris and the Vagina Study	George Ludwig Kobelt	Connecting vaginal folds with sensation
early 20th century	Hormone Effects Research	Several endocrinologists	Confirming the cause of estrogen
1970s	Women's health exercise	Women's rights groups	Promoting equality in vaginal research
Modern (2000s-)	Imaging and Functional Research	PubMed, etc.	Quantifying the effect of wrinkles

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Diagram of vaginal folds

hierarchy	structure	Function	Relationship with folds
mucosa	Epithelial cells, folds	secrete lubricating fluid	Forming folds to provide elasticity
muscle layer	smooth muscle	contraction and expansion	Supports wrinkle stretching
Fiber layer	connective tissue	Structural support	Maintain the shape of the folds
outer layer	Blood vessels and nerves	Sensory conduction	Enhanced wrinkle sensitivity

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Microscopic features of folds

Vaginal folds are formed by epithelial cells and contain abundant blood vessels and nerve endings. Under hormonal influence, the number of folds increases after puberty and decreases after menopause. Under a microscope, the folds increase the surface area by 2-3 times, which helps in the distribution of secretions.

Evolutionarily, the vaginal structure is adapted to the reproductive needs of mammals, with folds similar to those of other mammals, used to cope with the stress of childbirth. The vagina is not only responsible for reproduction but also participates in immune defense, maintaining an acidic environment through lactobacilli to inhibit pathogens. Surrounding muscles, such as the pubococcygeus muscle, provide support and contract during sexual arousal, affecting the tension of the folds.

Furthermore, the vaginal environment changes with life stages: during the neonatal period, the pH is acidic due to maternal hormones; it is neutral before puberty; it becomes highly acidic during the reproductive years; and after menopause, it becomes more alkaline and the folds decrease. These changes emphasize the vagina's dynamic nature as an organ.

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Structure and function of vaginal folds

Structural description

Vaginal folds are transverse folds of the vaginal mucosa, resembling accordion pleats, supported by collagen, elastic fibers, and vascular plexuses. Under a microscope, the epithelial layer consists of squamous cells, while the underlying connective tissue is rich in nerve endings and lymphatic vessels. There can be hundreds of folds, each 0.5-1 mm thick, capable of stretching 30%-80%. In a non-excited state, the folds keep the vagina compact; during arousal, they partially unfold.

Main functions

1. Elasticity and stretchabilityThe folds allow the vagina to expand several times its normal size for childbirth or intercourse. Studies show that the folds unfold during childbirth, reducing the risk of tearing.
2. Enhanced sensitivity and surface areaIncreased surface area promotes sensory transmission and secretion storage, enhancing tactile sensitivity.
3. Protection and antibacterialIt forms a barrier and maintains an acidic environment to prevent infection.
4. Evolutionary usesIt adapts to a narrow pelvis and upright walking.

The following table summarizes the pleat function:

Functional type	describe	Examples
mechanical	Expansion and contraction	Childbirth stretching
physiological	Lubrication and feel	Secretion during sexual arousal
Protect	Barrier function	Infection prevention
evolution	Adaptability	Increase breeding success rate

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Causes of vaginal folds

Physiological causes

The formation of vaginal folds is primarily driven by estrogen. During puberty, estrogen promotes mucosal proliferation, forming folds to accommodate future childbirth and sexual activity. The folds become more pronounced during pregnancy to facilitate fetal passage. With age or a decline in hormone levels (such as menopause), the folds flatten.

Evolutionary causes

From an evolutionary perspective, vaginal folds are an adaptive feature. In primates, similar structures allow the vagina to expand to several times its original size, preventing injury. Studies show that human vaginal folds are more complex than those in other mammals, possibly related to bipedalism.

Pathological causes

In some cases, abnormal wrinkles, such as vaginal atrophy, caused by hormone deficiency, lead to dryness and discomfort. Infection or trauma can also alter the shape of wrinkles.

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Comparison of vaginal fold density with age

Age Groups	Average fold density (folds/cm²)	Functional impact
Adolescence (12-18 years old)	20-30	High elasticity, sexual development period
Childbearing age (19-40 years old)	15-25	Optimal expansion and pleasure
Menopause (ages 41-60)	5-15	Reduction requires medical intervention
Elderly (>60 years old)	<5	Discomfort

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Penis insertion into the vagina provides a pleasure mechanism

1. Friction and pressureThe wrinkles create an irregular surface, generating wave-like stimulation during insertion and enhancing glans sensitivity.
2. Elastic adaptationIt fits snugly against the penis, creating a gripping effect.
3. Smoothness and three-dimensionalitySecretions fill the wrinkles and preserve the texture.

The survey shows that men with 60% do not believe that the appearance of the vulva affects their libido, but internal textures such as folds can enhance pleasure. However, pleasure is subjective and influenced by psychology.

Contribution of factors to sexual pleasure

factor	Contribution to male pleasure (%)	illustrate
wrinkles and friction	40	Increase tactile stimulation
Lubrication	30	Reduce discomfort
Muscle contraction	20	Hold tightly during climax
Other (psychological, etc.)	10	Individual differences

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The role of vaginal folds in sexual intercourse and their impact on men

Physiological mechanisms of sexual intercourse

During sexual arousal, the vagina becomes engorged with blood, its folds unfold, providing a feeling of tightness. When the penis is inserted, the folds create friction, stimulating nerve endings.

Effects of male pleasure

The folds and wrinkles add texture, creating a "massage" effect that enhances male pleasure. Studies show that the folds in the vaginal wall can enhance stimulation, especially in the vaginal canal.Kegel MovementDuring vaginal contractions, most men report that a more textured vagina provides greater pleasure, but individual differences exist. However, not all female vaginal orgasms rely on folds; clitoral stimulation is more crucial.

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A rare and highly sought-after "masterpiece"

• Physiological basisThe density of wrinkles and muscle tension do indeed affect pleasure.
• suckingforce : A woman with dense folds can make a man feel the folds inside her vagina tightly rubbing against his penis, so tight that there are no gaps, similar to a vacuum suction, and the pleasure is transmitted from the penis to the whole body, bringing the man extreme pleasure.
• Friction and pressureThe wrinkles create an irregular surface, producing a wavy stimulation during insertion, which enhances the sensitivity of the glans.
• Elastic adaptationThe folds and muscle contractions cause the vagina to press tightly against the penis, creating a "gripping" effect.
• Smoothness and three-dimensionalitySecretions fill the wrinkles, retain texture, and provide a "grainy" feel.

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vaginal folds disappear

In older women and women with estrogen deficiency, the vaginal folds may disappear. The disappearance of vaginal folds may be related to anterior vaginal wall prolapse, which can occur when the supporting structures between the vagina and bladder are damaged.

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in conclusion

The folds inside the vagina are a product of hormones and evolution, serving functions including elasticity, protection, and enhanced pleasure. For men, these folds do indeed enhance penetration pleasure. Historical timelines and charts reinforce the analysis. Future research should integrate across disciplines.

Further reading:

• [Video] Understanding the Female Clitoris
• Female G-spot
• Vagina Museum
• The dick is still dick, don't use your hands to tease it