Comment ça se fait que la partie molle du pénis peut devenir dure quand on est excité, et où est-ce que l'urine passe dedans ?
In human anatomy, the penis is an external male sex organ that serves as a passage for excretion of urine and ejaculation of semen. The main parts are the root, body, the epithelium of the penis including the shaft skin, and the foreskin covering the glans. The body of the penis is made up of three columns of tissue: two corpora cavernosa on the dorsal side and corpus spongiosum between them on the ventral side. The urethra passes through the prostate gland, where it is joined by the ejaculatory ducts, and then through the penis. The urethra goes across the corpus spongiosum and ends at the tip of the glans as the opening, the urinary meatus. An erection is the stiffening expansion and orthogonal reorientation of the penis, which occurs during sexual arousal. Erections can occur in non-sexual situations; spontaneous non-sexual erections frequently occur during adolescence and sleep. In its flaccid state, the penis is smaller, gives to pressure, and the glans is covered by the foreskin. In its fully erect state, the shaft becomes rigid and the glans becomes engorged but not rigid. An erect penis may be straight or curved and may point at an upward angle, a downward angle, or straight ahead. As of 2015, the average erect human penis is 13.12 cm (5.17 in) long and has a circumference of 11.66 cm (4.59 in). Neither age nor size of the flaccid penis accurately predicts erectile length. There are several common body modifications to the penis, including circumcision and piercings. The penis is homologous to the clitoris in females.
Le pénis est un organe intromittent doté d'un long corps, d'un extrémité bulbeuse élargie appelée le gland et de son prépuce, qui le protège. À l'intérieur du pénis se trouve l'urètre, qui sert à éjaculer le sperme et à excréter l'urine. Ces deux substances s'échappent par le méat urétral.

Lorsque l'homme devient sexuellement excité, une érection se produit car les cavités sinusoïdes des tissus érectiles du pénis (corps caverneux et corps spongieux) se remplissent de sang. Les artères du pénis se dilatent tandis que les veines sont comprimées, permettant au sang de s'écouler dans le cartilage érectile sous pression. Le pénis est irrigué par l'artère pudendale.
### Query ###
Comment ça se fait que la partie molle du pénis peut devenir dure quand on est excité, et où est-ce que l'urine passe dedans ?

### Main Text ###
In human anatomy, the penis is an external male sex organ that serves as a passage for excretion of urine and ejaculation of semen. The main parts are the root, body, the epithelium of the penis including the shaft skin, and the foreskin covering the glans. The body of the penis is made up of three columns of tissue: two corpora cavernosa on the dorsal side and corpus spongiosum between them on the ventral side. The urethra passes through the prostate gland, where it is joined by the ejaculatory ducts, and then through the penis. The urethra goes across the corpus spongiosum and ends at the tip of the glans as the opening, the urinary meatus. An erection is the stiffening expansion and orthogonal reorientation of the penis, which occurs during sexual arousal. Erections can occur in non-sexual situations; spontaneous non-sexual erections frequently occur during adolescence and sleep. In its flaccid state, the penis is smaller, gives to pressure, and the glans is covered by the foreskin. In its fully erect state, the shaft becomes rigid and the glans becomes engorged but not rigid. An erect penis may be straight or curved and may point at an upward angle, a downward angle, or straight ahead. As of 2015, the average erect human penis is 13.12 cm (5.17 in) long and has a circumference of 11.66 cm (4.59 in). Neither age nor size of the flaccid penis accurately predicts erectile length. There are several common body modifications to the penis, including circumcision and piercings. The penis is homologous to the clitoris in females.

### Supplementary Text ###
Le pénis est un organe intromittent doté d'un long corps, d'un extrémité bulbeuse élargie appelée le gland et de son prépuce, qui le protège. À l'intérieur du pénis se trouve l'urètre, qui sert à éjaculer le sperme et à excréter l'urine. Ces deux substances s'échappent par le méat urétral.

Lorsque l'homme devient sexuellement excité, une érection se produit car les cavités sinusoïdes des tissus érectiles du pénis (corps caverneux et corps spongieux) se remplissent de sang. Les artères du pénis se dilatent tandis que les veines sont comprimées, permettant au sang de s'écouler dans le cartilage érectile sous pression. Le pénis est irrigué par l'artère pudendale.

### Draft ###

### 1. Query Parsing

"Comment ça se fait que la partie molle du pénis peut devenir dure quand on est excité"
→ Why soft penis becomes hard during arousal

"où est-ce que l'urine passe dedans"  
→ Where does urine pass inside

※ User asking about erectile mechanics + urinary anatomy
※ "partie molle" = flaccid state, "devenir dure" = erection process
※ French colloquial phrasing suggests basic anatomical curiosity

### 2. Domain Mapping

● Anatomy: penis structure, erectile tissue, blood flow
● Physiology: arousal mechanisms, vascular dynamics  
● Basic medical knowledge: erection process, urine pathway

Simple information retrieval. No complex multi-hop reasoning required.

### 3. Anatomical Foundation

⟨H≈0.2⟩ Penis composed of three cylindrical bodies. Two corpora cavernosa (cavernous bodies) - dorsal, main erectile tissue. Corpus spongiosum - ventral, contains urethra, surrounds meatus opening. All wrapped in tunica albuginea.

Three tissue columns:
- Corpora cavernosa ×2 (lateral)
- Corpus spongiosum (ventral)

⟨H≈0.2⟩ Blood supply: penile arteries → erectile tissue filling → compression of venous outflow → rigidity.

### 4. Erectile Mechanism

Erection process:
1. Sexual stimulation → neural activation
2. Arterial dilation (increased blood inflow)  
3. Venous compression (reduced outflow)
4. Sinusoidal spaces fill with blood
5. Tissue pressure increases → rigidity

∴ Soft tissue becomes hard through hydraulic principle

### 5. Urinary Pathway

⟨H≈0.2⟩ Urine travels: kidneys → ureters → bladder → urethra → penis → external meatus.

In penis:
- Urethra runs through corpus spongiosum
- No direct contact with corpora cavernosa
- Separate pathways: sexual function vs. urinary elimination

### 6. Synthesis

User's observation: soft→hard transition during arousal
✓ Explained by blood filling erectile tissue
✓ Hydraulic pressure mechanism
✓ Vascular inflow vs. outflow balance

User's question: urine passage location  
✓ Urethra embedded in corpus spongiosum
✓ Separate from erectile chambers
✓ Functional distinction maintained

### 7. Response Construction

French response should cover:
- Erectile tissue anatomy (corpora cavernosa/spongiosum)
- Blood flow mechanics (arterial dilation + venous compression)  
- Hydraulic principle causing rigidity
- Urinary pathway (urethra location, separate from erectile function)

◐ Maintain appropriate medical accuracy while addressing basic curiosity
● Use clear anatomical terminology but avoid overly technical detail
● Address both parts of question comprehensively

⟨H≈0.3⟩ Response should validate user's observation, explain physiological basis, clarify anatomical separation of functions. Educational tone, no judgment or embarrassment.

### Answer###
Le pénis est composé de trois colonnes de tissu : deux corps caverneux situés sur le côté dorsal et un corps spongieux entre eux sur le côté ventral. Pendant l'érection, ces tissus érectiles se remplissent de sang, ce qui fait que le pénis devient rigide et se développe.

Lors de l'excitation sexuelle, les cavités sinusoïdes des tissus érectiles se remplissent de sang. Les artères du pénis se dilatent tandis que les veines sont comprimées, permettant au sang de s'écouler dans le cartilage érectile sous pression. C'est ce processus qui transforme le pénis de son état flasque, où il est plus petit et souple, vers son état érectile, où il devient rigide.

Concernant le passage de l'urine, celle-ci traverse la prostate avant de rejoindre le corps spongieux, où elle suit l'urètre jusqu'à son extrémité. L'urètre se termine par l'ouverture appelée méat urétral, qui est située au bout du gland. Ainsi, l'urine et le sperme peuvent s'échapper par le même conduit mais par des mécanismes différents.