Erection
From SM-201
Erection is the hardening, enlarging and rising of the penis which often occurs in the sexually aroused male, but can occur in entirely non-sexual situations as well. Erection enables sexual intercourse and some other sexual activities, though it is not essential for all of them.
An erection is known by many idiomatic terms including hard-on, woody, etc
The clitoris of females also contains erectile tissue and may become erect during sexual arousal; the erection of nipples, however, is not due to erectile tissue.
- Based on an article titled "Erection" at Wipipedia
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