Assertion: withdrawal | /r/ObjectUse | used as birth control
Facets:
value: sometimes
type: TEMPORAL
Source sentences:
text: There are references that have led historians to believe withdrawal was sometimes used as birth control.
text: There are references that have led historians to believe withdrawal was sometimes used as birth control.  
text: There are references that have led historians to believe withdrawal was sometimes used as birth control.
text: There are references that have led historians to believe withdrawal was sometimes used as birth control.
text: There are references that have led historians to believe withdrawal was sometimes used as birth control.
text: There are references that have led historians to believe withdrawal was sometimes used as birth control.
text: There are references that have led historians to believe withdrawal was sometimes used as birth control.