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After maximum erection is obtained, the subject’s penis subsequently becomes flaccid again (3:55). Also visible in this demonstration are the tightening of the subject’s scrotum and the elevating of his testicles during arousal. This conscious process can be compared with the same subject's unconscious nocturnal erection process.
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Video_of_Penile_erection.ogv (Ogg multiplexed audio/video file, Theora/Vorbis, length 24 s, 320 × 240 pixels, 989 kbps overall, file size: 2.8 MB) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
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).
An erection (clinically: penile erection or penile tumescence) is a physiological phenomenon in which the penis becomes firm, engorged, and enlarged. Penile erection is the result of a complex interaction of psychological, neural, vascular, and endocrine factors, and is often associated with sexual arousal, sexual attraction or libido, although erections can also be spontaneous.
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Articles relating to the human penis, an external male sex organ (intromittent organ) that additionally serves as the urinary duct.The main parts are the root, body, the epithelium of the penis including the shaft skin, and the foreskin covering the glans.