The clitoris: how does it work?

What is the clitoris?

The clitoris is an extensive internal erectile organ designed exclusively for pleasure. Contrary to what is often believed, the small glans visible beneath the hood represents no more than 10% of the entire organ. The clitoris as a whole measures up to 9 cm in height and width, including its internal crura—it literally surrounds the vagina like a wishbone, and its erectile tissues swell during arousal just as they do during a penile erection.

The main types of clitoral stimulation are:

• Direct external stimulation: on the clitoral glans and hood
• Suction or air-pulse stimulation: around the clitoral hood
• Indirect internal stimulation: via the vestibular bulbs and crura during penetration
• Dual stimulation: simultaneous clitoral and vaginal stimulation
• Deep vibration stimulation: transmitted through the tissues to the internal roots

In our specialty shop, clitoral vibrators and suction stimulators are the most requested sex toys among women, whether they are beginners or already have an established practice. Understanding clitoral anatomy often radically changes the criteria for choosing one.

Clitoral anatomy: the complete organ

The clitoris consists of several distinct structures that together form a Y-shaped or wishbone-shaped organ. It surrounds the vagina internally through its crura and bulbs—which explains why some stimulation that appears to be vaginal is actually indirect clitoral stimulation.

The clitoral glans

The glans—the visible part—is a small, extremely innervated ovoid structure. Its length varies from 2 to 35 mm depending on the individual, with an average diameter of approximately 1.9 to 2.5 cm. It is the area with the highest density of sensory receptors in the entire organ. It is partially or completely covered by the clitoral hood (foreskin), a protective membrane that, when it covers too much, can reduce perceived sensitivity during direct stimulation. This anatomical variation partly explains why some women respond better to indirect stimulation through the hood than to direct stimulation of the glans.

The clitoral body

Under the hood, the clitoral body is a cylindrical segment 2 to 4 cm long and 1 to 2 cm wide. It can be felt beneath the skin above the glans and then divides into two internal branches called the crura.

The crura (branches)

The crura are two erectile extensions that curve along either side of the vagina for 5 to 9 cm each. Anatomical 3D modeling has shown that one branch measures up to 10 cm from the glans to its tip—illustrating the organ’s true extent, which is completely invisible from the outside. The crura explain sensations experienced during lateral pressure on the vulva or during penetration with strong pressure against the vaginal walls.

The vestibular bulbs

The vestibular bulbs are two masses of erectile tissue located on either side of the vaginal opening. They swell during arousal, increasing vaginal sensitivity and creating a sensation of fullness and tightness. They explain why penetration can indirectly contribute to orgasm in some women—through compression of the swollen bulbs against the vaginal walls and the penis or sex toy.

The root

The root is the deepest part of the clitoris, anchored in the pelvis via the pubic fascia. It connects the entire structure and enables the transmission of deep sensations during low-frequency vibration or sustained pressure stimulation.

The clitoris–urinary meatus distance (CUMD)

The distance between the clitoral glans and the urethral opening varies from 1.6 to 4.5 cm among individuals. This measurement, called CUMD (clitoro-urethral meatus distance), influences how easily vaginal penetration indirectly stimulates the clitoris. A shorter distance favors indirect contact during intercourse, but by itself does not predict the ability to reach orgasm without direct stimulation.

Changes in clitoral tissue with age

The erectile tissue of the clitoris changes with age. A comparative histological study (cadavers of young women, average age 28, versus older women, average age 75) measured significant changes: collagen density increased from 24 ± 9.78% to 46 ± 10.89%, while the proportion of smooth muscle decreased from 41% to 37%. Other anatomical studies further describe this change across the lifespan: smooth muscle tissue accounts for approximately 65% in children and adolescents, 50% in women aged 44 to 54, and 37% after age 55. This decrease in smooth muscle gradually reduces erectile rigidity and may contribute to a less intense response. These changes do not mean that clitoral pleasure disappears, but they do support adapting sexual practices: consistent lubrication, longer preliminary stimulation, and moderate-frequency vibrations (40–80 Hz) rather than high-frequency ones.

Innervation: more than 10,000 nerve fibers

The clitoris is the most densely innervated organ in the human body. Recent scientific research has substantially revised previous estimates upward and is changing how optimal clitoral stimulation is understood.

The figure of 10,281 nerve fibers

An anatomical study conducted at OHSU in 2022 counted approximately 5,140 nerve fibers in the dorsal nerve of the clitoris. Because this nerve divides symmetrically on either side of the organ, the estimated total is 10,281 nerve fibers throughout the clitoral glans—significantly more than the 8,000 cited in previous estimates, and more than the 4,000 fibers in the dorsal nerve of the penis. A study published in Scientific Reports in 2024 confirmed these figures through histology and micro-CT, measuring approximately 2,917 axons in the branch near the crura and 3,137 axons in the branch near the body, of which 76% and 71%, respectively, are myelinated—that is, surrounded by a conductive sheath that accelerates the transmission of nerve signals to the brain.

Six times greater density than in the penis

The density of innervation in the clitoris is six times higher per unit area than in the penis. This is not merely a question of the absolute number of fibers—it is a question of concentration over a very small area, which explains the intensity of sensations produced by even light stimulation, and why stimulation that is too direct or too intense can quickly become uncomfortable.

Krause corpuscles: vibration sensors

Krause corpuscles are specialized sensory receptors that detect vibrations. A 2024 study published in PMC showed that their density in the clitoral glans is 15 times higher than in the penis. These receptors respond optimally to vibrations between 40 and 80 Hz—a precise frequency range that can be directly applied when choosing a vibrating sex toy.

Erectile function and sexual response

The clitoris operates according to an erectile mechanism identical to that of the penis. During arousal, the erectile tissue—the corpora cavernosa, crura, and vestibular bulbs—fills with blood through arterial inflow. The glans swells and becomes more prominent beneath the hood, the bulbs compress the vaginal walls, and the crura exert internal pressure on the sides of the vagina.

This swelling has two direct effects on stimulation:

• The glans becomes more accessible and sensitive—external stimulation is more effective once arousal is already present
• The swollen bulbs increase sensitivity to internal vaginal stimulation—which is why penetration is generally more pleasurable after sufficient prior arousal

After orgasm, the tissues subside but remain sensitive for a few minutes. Direct stimulation of the glans can become uncomfortable or even painful immediately after orgasm—this is a normal physiological reaction, not a sign of a problem. Adjusting the pressure and switching to more diffuse or deeper stimulation can prolong pleasure without discomfort.

Orgasm and stimulation methods: the real data

Scientific data on the pathways to female orgasm contradict many widespread misconceptions—including those found in pornography and popular culture.

What the research says

A representative survey published in the Journal of Sexual Medicine (2023) asked women who regularly have heterosexual intercourse about the stimulation methods that lead them to orgasm. The results are unambiguous:

In summary: 93% of women who reach orgasm during heterosexual intercourse need clitoral stimulation, either alone or combined with penetration. Only 5.1% of all women surveyed reach orgasm through vaginal penetration alone, without direct clitoral stimulation.

Preferred types of touch

A study conducted by Herbenick et al. (2017) asked women about the precise form of clitoral stimulation that leads them to orgasm:

• Vertical or circular movements: approximately 40% of women
• Back-and-forth movements: approximately 37%
• Stable rhythm maintained until orgasm: approximately 75%

This latter figure is particularly useful when choosing a sex toy: three out of four women need a stable, consistent rhythm to reach orgasm. Sex toys whose motors become less consistent at higher intensities are therefore less effective than those that maintain a stable vibration all the way through.

Penetration and the internal clitoris

22% of women report having reached orgasm through vaginal penetration alone, 36% say they have never experienced it, and 41.5% are uncertain. These data suggest that when penetration alone produces orgasm, it is probably through indirect stimulation of the crura and vestibular bulbs—which surround the vagina and are compressed during penetration—rather than through intrinsic vaginal stimulation.

Who it’s for: adapting stimulation to your profile

Direct sensitivity of the glans

Some women have a very accessible glans and respond well to direct stimulation—precision-head vibrators and oscillating-pressure stimulators. Others have a more covering clitoral hood, which makes direct stimulation uncomfortable—they benefit more from stimulation through the hood or from a suction stimulator that works around the glans without direct contact.

Preference for external stimulation

Women who reach orgasm primarily or exclusively through external clitoral stimulation are best served by compact clitoral vibrators, suction stimulators, and wands. Rabbits and dual stimulators may be less effective if the clitoral arm does not align properly with the individual’s anatomy.

Preference for dual stimulation

For the 75.8% of women who reach orgasm more easily with simultaneous clitoral and vaginal stimulation, rabbits, dual stimulators, and vibrating cock rings are the most suitable formats. The key is matching the insertable length to the exact position of the clitoral arm—which varies according to each individual’s CUMD.

Clitoral hypersensitivity

Some women have very high sensitivity in the glans, making prolonged direct stimulation uncomfortable. Suction stimulators are often better tolerated in this case—they work around the hood rather than directly on the glans. Wide-headed vibrators spread the vibrations over a larger surface, reducing localized intensity.

After menopause

The gradual decrease in smooth muscle tissue and increase in collagen reduce erectile rigidity with age. Natural lubrication also decreases. These changes call for consistent use of a water-based lubricant, moderate-frequency rather than very high-frequency vibrations, and a longer period of preliminary stimulation to allow the erectile tissue to become fully engorged before direct stimulation.

How to choose a clitoral sex toy

Vibration frequency: 40 to 80 Hz

The Krause corpuscles — the clitoris's vibrotactile receptors — respond optimally to frequencies between 40 and 80 Hz. This range corresponds to vibrations perceived as "deep" and "round" rather than as surface buzzing. The linear motors in high-end ranges (Womanizer, Lelo, We-Vibe) generally operate in this range more precisely than the ERM motors in entry-level ranges.

Motor consistency

75% of women need a consistent rhythm to reach orgasm. Motor quality — its ability to maintain a stable vibration without losing power at high intensities — is therefore a direct performance criterion. Linear motors are superior to ERM motors in this respect.

The shape of the head

The shape of the vibrator head determines whether stimulation is concentrated on the glans or diffused across the entire vulva. A small, precise head is suitable for women who prefer targeted stimulation. A wide head is suitable for women who are hypersensitive or prefer more diffuse stimulation. Air-pulse stimulators have a nozzle-shaped head that must be positioned around the clitoral hood — the diameter of this nozzle should approximately match the size of the glans.

Vibration vs. suction

Clitoral vibrators transmit mechanical vibrations to the surface of the clitoris. Air-pulse stimulators create air pulsations around the clitoral hood, activating the Krause corpuscles without direct contact with the glans. The sensation is fundamentally different — suction is often described as more direct and quicker to orgasm, while vibration is more diffuse and easier to control gradually. The two technologies complement each other, and some models combine them.

Intensity and levels

A minimum of 5 intensity levels allows for fine progression. The lowest level should be low enough for use without prior arousal — starting too strongly on an unaroused glans can be uncomfortable. Gradually increasing the intensity exactly follows the natural progression of the clitoral erectile response.

Anatomical compatibility

The CUMD — between 1.6 and 4.5 cm depending on the individual — determines the optimal positioning of a sex toy on the clitoris. A rabbit vibrator whose clitoral arm is positioned at a certain height will not suit every body type. For external clitoral vibrators, the flexibility of the neck or shaft makes it possible to adjust the angle and positioning.

Comparison of clitoral stimulation technologies

Useful differences to know

Direct vs. indirect stimulation: direct stimulation of the glans is very intense but can quickly become uncomfortable without prior arousal or after orgasm. Stimulation through or around the hood is often gentler and easier to maintain over time. Most women alternate between the two depending on their level of arousal.

Clitoral orgasm vs. vaginal orgasm: the traditional distinction between “clitoral orgasm” and “vaginal orgasm” is anatomically debatable. Orgasms produced by vaginal penetration very likely involve indirect stimulation of the crura and vestibular bulbs—which are part of the clitoris. There are not two different organs, but a single extended organ that can be stimulated in several ways.

High-frequency vs. low-frequency vibrations: high-frequency vibrations (above 100 Hz) feel superficial and buzzing—they primarily stimulate the skin and glans. Low- and mid-frequency vibrations (40 to 80 Hz) feel deeper—they reach the subcutaneous tissues and stimulate Krause corpuscles and potentially internal structures more effectively.

Common mistakes to avoid

• Starting at maximum intensity: on an unaroused glans, excessive intensity is uncomfortable and may cause temporary desensitization. Start low and increase gradually as arousal builds.
• Maintaining excessive, prolonged pressure on the glans: the clitoris’s high nerve density makes excessive pressure quickly painful. Prefer light, steady contact over strong, static pressure.
• Choosing a rabbit without considering your anatomy: a rabbit whose clitoral arm does not match your individual CUMD distance will not stimulate the clitoris effectively, regardless of its intrinsic quality. Check the dimensions and reviews about positioning before buying.
• Confusing suction with vibration: the two technologies produce fundamentally different sensations. A woman who has not responded to classic vibrators may respond very well to suction—and vice versa. Both are worth trying.
• Using a silicone-based lubricant with a platinum-silicone sex toy: it irreversibly damages the material. Always use a water-based lubricant with silicone sex toys.
• Stimulating without preliminary arousal: an unaroused clitoris is less receptive and more easily irritated by direct stimulation. A preliminary warm-up—light caresses around the vulva, kissing, or massage—significantly increases the effectiveness of direct stimulation.
• Do not explore internal structures: most clitoral sex toys target only the external glans. U-shaped models or dual stimulators that apply slight pressure to the bulbs and crura offer more comprehensive stimulation of the organ as a whole.

Usage tips

• Warm-up: start with gentle caresses around the clitoris and vulva. Preliminary arousal engorges the erectile tissues and significantly improves receptiveness to direct stimulation.
• Lubrication: always use a water-based lubricant on the sex toy's head and on the clitoris—even when natural lubrication is sufficient. Lubrication reduces friction and makes stimulation smoother and more pleasurable.
• Steady rhythm: 75% of women reach orgasm with a consistent rhythm. Once you find the right positioning and intensity level, maintain the rhythm without interrupting it or increasing it abruptly.
• Explore positioning: slightly above the glans, directly on it, or to the side—the optimal positioning varies from person to person. Try different angles and positions before deciding that a sex toy is unsuitable.
• After orgasm: the glans may become hypersensitive immediately after orgasm. Switch to gentler, more diffuse stimulation, or take a break before resuming.
• Combine with vaginal stimulation: for women who respond better to dual stimulation, use a clitoral vibrator alongside a vaginal sex toy or during intercourse to maximize effectiveness.

Adopt1Toy collections for clitoral stimulation

• Clitoral vibrators — the complete selection, from compact models to wands
• Suction stimulators — air pulsation, without direct contact with the glans
• Connected suction stimulators — app control
• Dual stimulation — simultaneous clitoral and vaginal stimulation
• Micro and wand vibrators — from the most discreet to the most powerful

In brief: how to choose your clitoral sex toy

• Identify your preference: direct stimulation of the glans or stimulation around the clitoral hood
• Choose the right technology: vibration for versatility, suction for stimulation without direct contact
• Choose a stable motor in the 40 to 80 Hz range to effectively stimulate Krause's corpuscles
• Check the number of intensity levels — at least 5 for fine-tuned progression
• For a blended orgasm: choose a rabbit or dual stimulator compatible with your CUMD
• Always use a water-based lubricant
• Start at a low intensity, then maintain a steady rhythm as orgasm approaches