Assertion: foreskin | /r/CapableOf | retract upon erection
Facets:
value: generally
type: MANNER
Source sentences:
text: The foreskin typically covers the glans when the penis is not erect (top image), but generally retracts upon erection (bottom image).
text: Upon erection, the foreskin may retract and unroll of itself into a single layered cylinder, but not necessarily, and can usually be retracted manually.