Socio-sexual Aspects
Erection is a common indicator of sexual arousal and is required for a male to effect vaginal penetration and sexual intercourse. The scrotum may, but not always, become tightened during erection. Generally, the foreskin automatically and gradually retracts, exposing the glans, though some males may have to manually retract their foreskin.
After reaching puberty, erections occur much more frequently. Male erections are common for children and infants, and even occur before birth.
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—Henry David Thoreau (1817–1862)