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Tumescence is the quality or state of being tumescent or swollen. Tumescence usually refers to the normal engorgement with blood [ 1 ] ( vascular congestion ) of the erectile tissues , marking sexual excitation , and possible readiness for sexual activity .
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.
The goal of nocturnal penile tumescence testing is to determine whether one can experience an erection while sleeping after reporting that they are unable to experience an erection while awake. On average, one has 3–5 episodes of NPT each night, and each episode lasts 30–60 minutes, although the duration is reduced with advanced age. [ 16 ]
Equally, a male erection can occur during sleep (nocturnal penile tumescence) without conscious sexual arousal or due to mechanical stimulation (e.g., rubbing against the bed sheet) alone. A young man—or one with a strong libido—may experience enough sexual arousal for an erection to result from a passing thought, or just the sight of a ...
Clitoral erection (also known as clitoral tumescence or female erection) [1] [2] is a physiological phenomenon where the clitoris becomes enlarged and firm. Clitoral erection is the result of a complex interaction of psychological, neural, vascular, and endocrine factors, and is usually, though not exclusively, associated with sexual arousal .
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.
An erection is the stiffening expansion and orthogonal reorientation of the penis, which occurs during sexual arousal. Erections can occur in non-sexual situations; spontaneous non-sexual erections frequently occur during adolescence and sleep. In its flaccid state, the penis is smaller, gives to pressure, and the glans is covered by the foreskin.
Erectile tissue exists in external genitals such as the corpora cavernosa of the penis and their homologs in the clitoris, also called the corpora cavernosa. [2] During penile or clitoral erection , the corpora cavernosa will become engorged with arterial blood, a process called tumescence . [ 3 ]