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-shən) of a body part such as a man's penis, a woman's clitoris or a nipple refers to it becoming larger and harder.
The term erection is most often used to refer to an erection of the penis.
Erect penises have appeared in erotic (sexually exciting) art for a very long time.
Pictures of men with erections appear on ancient objects and in paintings.
Around the whole urethra is tissue called the corpus spongiosum penis (which is Latin for "body of the penis that is like a sponge"). Also inside the penis near its upper surface are two cylindrical tissues called the corpora cavernosa penis (Latin for "bodies of the penis that are like caves").
(One of these tissues by itself is called a corpus cavernosum.) The corpus spongiosum penis and corpora cavernosa penis are filled with many blood vessels called arteries which carry blood.
Thus, the corpus spongiosum penis and corpora cavernosa penis all fill with blood and become larger and harder.Today, erect penises do not often appear in artworks or movies because many people think that showing a man's penis when it is erect is obscene (not decent).Men with larger penises are often thought to be more handsome, manly and powerful.The clitoris also has a corpora cavernosa, and when a woman is sexually excited this part of the clitoris fill with blood.
This causes the clitoris and other parts of the woman's sex organs to become larger, harder, redder in colour, and very sensitive to being touched.
When a man is sexually aroused or stimulated (made sexually excited) by touch – for example, if he masturbates or another person touches him in a sexual way – the touching is picked up by nerves in the arteries of the corpus spongiosum penis and corpora cavernosa penis.