Assertion: semen's sperm | /r/HasAspect | difficulty
Facets:
value: to fertilize it
type: PURPOSE
Source sentences:
text: Motility, or how sperm swims, is important, because sluggish sperm can have difficulty reaching the egg to successfully fertilize it.
text: Abnormally sized or shaped sperm can have difficulty reaching, penetrating, and fertilizing the egg.