How to Say "penis" in Spanish
The most common Spanish word for “penis” is “pene” — use 'pene' when referring to the penis in a medical, anatomical, or formal educational context.
pene
PEH-nehˈpene

Examples
El médico examinó el pene del paciente.
The doctor examined the patient's penis.
El médico le explicó cómo mantener una buena higiene en el pene.
The doctor explained to him how to maintain good hygiene of the penis.
El pene es parte del sistema reproductor masculino.
The penis is part of the male reproductive system.
En la clase de biología estudiamos la anatomía del pene.
In biology class, we studied the anatomy of the penis.
Always Masculine
This word is always masculine. You should always use it with masculine words like 'el' (the) or 'un' (a), even if you are talking about biology in a general sense.
Simple Plural
To talk about more than one, simply add an 's' at the end: 'los penes'.
Using Slang in Formal Settings
Mistake: “Using words like 'pito' or 'polla' at the doctor.”
Correction: Always use 'pene' in medical or formal situations to remain respectful and clear.
carajo
ka-RA-hokaˈɾa.xo

Examples
Me importa un carajo tu opinión.
I don't give a damn about your opinion.
Me importa un carajo lo que piensen los demás.
I don't give a damn what other people think.
Después de la discusión, lo mandó al carajo.
After the argument, she told him to go to hell.
Esa casa queda en el quinto carajo.
That house is in the middle of nowhere.
It Lives in Phrases
You'll almost never see 'carajo' used as a simple noun like 'libro' (book). It's almost always part of a set phrase that you can learn as a single vocabulary item.
Confusing 'pene' with 'carajo'
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