Meridian

Orgasm

The spasm is the orgasm. The gush in porn is mostly urine.

Masters and Johnson already defined female orgasm as rhythmic pelvic-floor contractions. That reflex has several triggers. It is not several species. Squirting is a different event: a bladder emptying through the urethra, sometimes with a splash of Skene’s fluid.

One reflex. Several doorbells.

High confidence

Masters and Johnson (1966): female orgasm is a spinal reflex — involuntary rhythmic contractions of the pelvic floor (pubococcygeus / levator ani), often with the uterus and the external anal sphincter, at roughly 0.8-second intervals, plus the autonomic dump (flush, heart rate, oxytocin). That spasming is the orgasm. Lubrication is not. Vaginal ‘mucus’ during sex is mostly plasma transudate through the vaginal wall, plus some cervical mucus. It appears in arousal, not as a certificate of climax. Contractions can squeeze leftover wetness out. That drip is not a separate orgasm type.

The other kinds

Different doorbells. Same house. Anal sphincter hitchhiking on a clitoral orgasm is not a separate species. Neither is leftover wetness being squeezed out.

Clitoral (glans)

High confidence

External glans and hood — fingers, mouth, bullet, air-pulse, wand.

Sharp, local, then pelvic-floor waves. The one most women can repeat on demand. Anal sphincter often joins because it is the same muscle sling, not because she had an ‘anal orgasm.’

Direct or slightly off-glans stimulation after arousal. Most solo orgasms. Most partnered orgasms that actually happen.

The default. ~18% of women orgasm from penetration alone; the rest need this, or this plus penetration.

Blended / internal wall

Moderate

Anterior vaginal wall (‘G-spot’) plus clitoris. The G-spot is not a unique organ — it is internal clitoral bulbs, urethral sponge, and Skene’s glands packed together (O’Connell).

Often described as fuller, more ‘inside,’ sometimes with a need to pee (that is the urethra). Same pelvic-floor pattern when it lands.

Come-hither pressure on the front wall, usually with clitoral stimulation at the same time. Penetration-only versions are the minority.

A different doorbell, not a different house. Poor replication of a discrete G-spot structure.

Cervical / deep

Moderate

Cervix and fornices. Komisaruk: a vagus-nerve path can carry this even when the spinal cord is cut. In intact women, pelvic and hypogastric nerves share that territory.

Deeper, slower, sometimes crampy or emotional. Less ‘spark’ than glans, more viscera.

Deep penetration at the right angle, or specific cervical pressure. Uncommon as the sole trigger in women with intact cords.

Real as a pathway. Rare as the everyday orgasm. Not what porn means by ‘cervical.’ See the vagus section.

Anal as trigger

Moderate

Dense pudendal innervation in the anus and perineal body. No female prostate. The same pelvic floor fires.

If it goes to orgasm, it feels like a genital orgasm with more fullness in the back. The anal sphincter spasming during a clitoral orgasm is not this — that is hitchhiking.

Slow dilation, lube, often with clitoral stimulation. Solo anal-only orgasm exists and is not the majority.

A trigger. Not a third genital.

Multiple / sequential

High confidence

Same clitoral or blended input, repeated. Women have a shorter refractory period than men; prolactin rise is smaller.

Second is often faster, sometimes flatter or bigger depending on engorgement and overstimulation.

Keep going, or pause and restart. Air-pulse and wands make this easier. Pregnancy T2 congestion also does.

Common enough to be ordinary, not a parlour trick.

Nipple, fantasy-only, coregasm

Low

Oxytocin/nipple; purely central (imagery); exercise loading the pelvic floor.

From ‘that counted’ to a full pelvic-floor sequence. Highly idiosyncratic.

Not trainable on a schedule. Documented, including thinking-off and gym coregasms.

Real and uncommon as the main diet. Do not build a typology around them.

Komisaruk · vagus

A spare wire to the brain. Not the everyday orgasm.

Moderate

Barry Komisaruk and Beverly Whipple showed that some women with a cut spinal cord can still feel cervical stimulation and, in a few cases, orgasm. The proposed wire is the vagus nerve — cranial nerve X — which never enters the cord. That is a bypass. It is not how most 18–40-year-olds finish.

Four cables

Pudendal

Clitoris, perineal skin, external anus

→ S2–S4 cord, then brain

The main doorbell for glans orgasm. Cut this and external clitoral sensation goes dark.

Pelvic splanchnic

Vagina and cervix

→ Sacral cord

Internal wall, vaginal barrel, much of ‘G-spot’ territory. Still a spinal path.

Hypogastric

Uterus and cervix

→ T10–L1 cord

Sympathetic viscera path. Why complete injury above T10 is the test case: it takes out hypogastric as well as the sacral routes below.

Vagus (CN X)

Proposed: cervix and uterus

→ Nodose ganglion → nucleus tractus solitarii in the medulla. No spinal cord.

The bypass. If the cord is fully cut above the genitospinal entries, this is the remaining candidate that can still ring the brain.

The mailbox sits under the skull, not in the spine.

Nodose is the inferior ganglion of the vagus. If a cervical signal rides CN X, the cell body lives here — a spindle of visceral sensory neurons in the neck — and the central axon goes through the jugular foramen into caudal NTS. That is the entire anatomical claim. It is not a sacral reflex.

Name

Inferior ganglion of CN X

Nodose = inferior. Jugular = superior, a centimetre higher, mostly somatic (ear, dura). Subdiaphragmatic viscera — gut, and the proposed uterus/cervix fibres — are almost confined to nodose (Neuhuber 2021). Jugular does not do the pelvis.

Where

Just below the skull base

Spindle in or just below the jugular fossa, then in the carotid sheath with the internal carotid. About 1 cm distal to the jugular ganglion. Human nodose: ~2.5 cm long, ~5 mm at its widest (classic Gray/Medscape figures).

Cells

Pseudounipolar, glutamatergic

One process splits: peripheral axon down the vagus, central axon into the medulla. Humans have on the order of 100,000 vagal sensory neurons per side (Prescott & Liberles 2022). Nodose is placodal (epibranchial); jugular is neural crest. In mice they fuse. In humans they stay separate.

Central target

Caudal NTS, some area postrema

Nodose axons hit caudal nucleus tractus solitarii and can graze area postrema. Jugular axons go to the paratrigeminal nucleus instead. That is why Komisaruk’s PET/fMRI looked at the NTS region, not S2.

  1. 01 · Cervix / uterus

    Rat HRP (Ortega-Villalobos 1990) from uterine wall labeled nodose cell bodies — and the dorsal motor nucleus, so some vagal motor to uterus exists in the rat too.

  2. 02 · Subdiaphragmatic trunks

    Peripheral axons would have to climb the abdomen with the anterior/posterior vagal trunks, through the esophageal hiatus. That is why cutting both vagi under the diaphragm killed the leftover cervical responses.

  3. 03 · Thoracic vagus → nodose

    Cell body in the neck spindle. No synapse here — it is a DRG analogue, not a relay. The spinal cord is never entered.

  4. 04 · Jugular foramen → caudal NTS

    Central process into the medulla. Glutamate onto NTS neurons. From there the usual orgasm network can still be recruited — hypothalamus, insula, NAcc, PAG — with the cord out.

High confidence on nodose as the visceral-vagal ganglion. Moderate on a human cervical fibre in it. The HRP is rat. No equivalent tracer has been shot into a woman’s cervix. Collins 1999 and Neuhuber’s review treat uterine vagal afferents as real in the rodent; the human jump is Komisaruk’s SCI imaging, not a dissection.

  1. 1990

    Rat tracer

    Horseradish peroxidase injected into rat cervix and uterus labeled cell bodies in the nodose ganglion — the sensory ganglion of the vagus. First anatomical hint that the reproductive tract has a cranial, not only spinal, afferent.

  2. 1990s

    Cut the spinal nerves, leftover remains

    In rats, cutting pudendal, pelvic, and hypogastric nerves or the cord reduced — but did not wipe — brain-mediated responses to vaginocervical stimulation. Cutting both vagi under the diaphragm abolished the leftover.

  3. 1996–97

    Women with complete SCI still respond

    Whipple, Gerdes, Komisaruk: some women with complete mid-thoracic SCI reported perceptual responses to vaginal or cervical self-stimulation, including analgesia and, in some, orgasm. Foot sensation was gone. Something else was carrying the signal.

  4. 2002

    PET: the NTS lights up

    Two women with complete SCI plus one uninjured control. Foot stimulation in the SCI women did not activate somatosensory thalamus. Cervical self-stimulation increased activity in the region of the nucleus of the solitary tract. n = 3. Preliminary, and pointed.

  5. 2004

    fMRI: orgasm on the bypass

    Komisaruk, Whipple, Crawford et al., Brain Research. Complete SCI above the genitospinal entries. Cervical self-stimulation in the scanner. NTS-region activation again. Three women reached orgasm. Finger analgesia during stimulation replicated the older pain-suppression finding.

What lights up

  • NTS (medulla) — the vagal mailbox. The specific claim.
  • Hypothalamus, amygdala, hippocampus, cingulate, insula, nucleus accumbens — the usual orgasm network, still recruited when the cord is out.
  • Periaqueductal gray — a plausible substrate for the analgesia Whipple measured at the fingers during cervical stimulation and orgasm.

What it feels like

Viscera-deep: slower than glans spark, sometimes crampy, sometimes a pressure-release, sometimes unexpectedly emotional. That matches a cranial visceral afferent better than a pudendal spark. It does not mean every deep orgasm in an intact woman is vagus. Intact women still have pelvic and hypogastric nerves on the same territory.

How it is triggered

Cervical or deep fornix pressure — fingers, a probe, a penis at the right angle, after arousal. Komisaruk’s subjects self-stimulated in the scanner. This is not air-pulse on the glans. In intact women the same motion mostly rides pelvic and hypogastric fibers.

What this is not

  • Not a different species of climax. The output is still a brain state plus, when motor nerves work, pelvic-floor spasms.
  • Not a map of typical 18–40 sex. Pudendal remains the reliable doorbell.
  • Not a large trial. PET n=3. fMRI a handful of SCI volunteers. NTS is small; fMRI is blunt. ‘Region of the NTS’ is not a single neuron.
  • Not settled human anatomy. Rat nodose labeling is cleaner than any dissection of a thick vagal bundle to the human cervix.
  • Not why second-trimester desire rises, and not a boy-versus-girl effect.
  • ‘Complete’ SCI can hide residual fibers. The foot-thalamus control was the right check. It is not infallible.

In a woman with an intact cord, cervical input can travel all four roads at once. The vagus is a spare. You cannot feel which cable fired. Claiming a partner ‘hit the vagus’ is storytelling. The honest claim: a pathway exists that can, when the cord is severed, still carry cervical sensation to the medulla and support orgasm.

Squirting

Porn squirting is a full bladder. The small milky pulse is something else.

High confidence

The gush is urine. There is no reproductive benefit. Porn fakes the volume.

Mostly right. Salama 2015 put ultrasound on seven women: bladder empty after peeing, full just before the gush, empty after. The fluid matched urine on urea, creatinine, and uric acid. PSA from Skene’s (the paraurethral / ‘female prostate’) showed up in five of seven — a splash, not the tank. Pastor and Chmel (2022) split the events: squirting is ≥10 ml transurethral from the bladder; female ejaculation is a few millilitres of thick PSA-rich fluid from Skene’s. They can happen together. They are not the same.

Schematic mix, not a lab fraction. Salama: urine markers dominate the gush; PSA is often present in trace. Female ejaculation is the small milky pulse.

Porn

The money shot is volume. Volume requires a bladder. Drink water, don’t pee, stimulate the urethra through the anterior wall, contract the pelvic floor. Some performers add a bulb of water. That is why it looks like a fountain and why it has no evolutionary job.

Benefit

No established biological benefit to squirting. It does not improve fertility, does not clean the vagina (wrong hole — it is urethral), does not mark ovulation. Skene’s glands are homologous to the prostate; a few millilitres of PSA-positive fluid is a leftover, not a function. A large gush is bladder mechanics plus a full tank plus pelvic-floor contraction. Coital incontinence is the unwelcome cousin of the same plumbing.

The event is not imaginary. Women do expel fluid. Calling every drop ‘fake’ is as sloppy as calling it ‘female semen.’ The honest line: the porn fountain is urine, sometimes diluted, sometimes mixed with a little Skene’s fluid, often performed. The orgasm, if one happens at the same time, is the spasm — not the puddle.

What they actually use

Herbenick 2009: 52.5% of U.S. women 18–60 have ever used a vibrator; about one in four in the past month. Rankings below are relative popularity among users, not a claim that every woman owns a Satisfyer. Retail bestseller lists (Lovehoney: air-pulse and wands) are sales, not a census. No study splits toys by whether the fetus is male or female — and none should.

18–30

Clit-first, cheap, viral. Air-pulse (Satisfyer, Womanizer) ate this cohort after 2014 because it orgasms the glans without a motor grinding on it. Hands are still the default.

  1. 01 · Hands only

    100

    Still the plurality of sessions. No purchase, no noise, no charging.

  2. 02 · Air-pulse (Satisfyer / Womanizer)

    88

    Pressure waves on the glans. Fast latency. TikTok/Reddit canon for this age.

  3. 03 · Bullet / small external vibe

    80

    First toy for a reason: quiet, cheap, clitoral, deniable.

  4. 04 · Rabbit / dual-stim

    48

    Bought more than it is finished with. Internal arm is extra; the ears do the work.

  5. 05 · Wand

    36

    Loud, strong, less apartment-friendly. Rises in the 30s.

30–40

Same anatomy, more money, less patience for toys that do not finish the job. Wand and dual-stim rise. Air-pulse stays. Hands stay.

  1. 01 · Hands only

    92

    Still first. More likely paired with a toy than in the 20s.

  2. 02 · Wand / strong external

    78

    Magic Wand lineage. Broad, deep, reliable. Houses, not dorms.

  3. 03 · Air-pulse

    74

    Once tried, often kept. Latency is the point.

  4. 04 · Bullet / small vibe

    70

    Partnered use and travel. Not retired.

  5. 05 · Rabbit / insertable + clit

    58

    Experience + disposable income. Internal stimulation is additive, not a replacement.

Pregnant

External wins. Insertables recede in T3. Fetal sex does not pick a toy. Side-lying, low-noise, no deep thrusting.

  1. 01 · Hands + air-pulse / bullet

    100

    No cervix bump, no depth, works on the side. T2 congestion can make them almost too much.

  2. 02 · Wand, low setting

    40

    Some keep it; many find it too much on already-engorged tissue.

  3. 03 · Insertable / rabbit

    18

    Abandoned as the uterus rises. Contraindicated with bleeding, placenta previa, or when a clinician said so.

Postpartum

Healing first. Lube is the actual tool. Insertables wait on clearance and on pain. Nursing dryness makes friction the enemy.

  1. 01 · Hands + lubricant

    100

    Lowest insult to a healing perineum and a hypoestrogenic vagina.

  2. 02 · External, low intensity

    55

    Once the 6-week visit is actually about tissue, not a deadline.

  3. 03 · Insertable

    12

    Last back. Pain on first postnatal sex is the default (86%). Do not add a stick.

How long a session lasts

Latency is minutes to orgasm. Session is start-to-stop. Partnered sex runs longer (~14 min to orgasm) because the stimulation is less precise, not because the reflex is slower.

18–30

8 min to orgasm · 13 min session

JSM 2018: ~8 min to orgasm masturbating vs ~14 with a partner. Superdrug convenience sample: ~13 min session. Vibrator shortens latency.

30–40

9 min to orgasm · 15 min session

Same reflex, slightly more narrative (Easton/Purifoy intensity). Wand/air-pulse can still land under 8.

Pregnant (T2)

6 min to orgasm · 10 min session

Congestion can speed the climb and shorten the window before ligament or bladder protest. T1 and T3 run the other way.

Postpartum

12 min to orgasm · 8 min session

If it happens at all. Exhaustion truncates the session; dryness and pain stretch latency. Nursing keeps this pattern.

Pregnancy intensity and postpartum pain live on pregnancy and after. Fantasy content lives on mind.