Assertion: penis's length | /r/HasProperty | observed
Facets:
value: during mating
type: TEMPORAL
Source sentences:
text: Accurate measurements are difficult to take because its erect length can only be observed during mating, which occurs underwater.
text: The largest penis belongs to the blue whale estimated at over 2 m (more than 6½ feet)[How to reference and link to summary or text]. Accurate measurements are difficult to take because the whale's erect length can only be observed during mating.