For Erection we have terms and definitions in 4 topics. The topics are Erectile Dysfunction, Sex, Sexual Health and Sexually Transmitted Diseases.

The state in which the penis fills with blood and becomes rigid.
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The enlargement and hardening of the penis due to vasocongestion that occurs during sexual arousal in the male.

A "hard" penis when it becomes full of blood and stiffens.
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When a penis gets stiff and hard. This happens because blood flows into it. This might happen because someone is sexually excited, but it can also happen at other times. A hard penis will get soft again after ejaculation or orgasm. It could also get soft before these things happen. Slang terms: woody, hard, hard-on, stiffy.
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