Was Natasha Romanoff Sterilized?

Romanoff didn't choose to be sterile, so it seems unfitting to compare her state to those who can't bear children naturally or choose not to conceive.

What does Black Widow mean by sterilize?

In “Avengers: Age of Ultron,” these are the words of Natasha Romanoff speaking to Bruce Banner after they mutually reveal they”re sterile, incapable of bearing children. ... His joining SHIELD was contingent that he”d get to have the wife, the kids, and the knowledge they”d be safe.

Is Natasha sterile?

All the "Black Widows" were sterilized, so Natasha is unable to bear children. ... It proved to be a controversial decision with the fans: the barren Natasha dies so Barton can return to his (soon to be un-disintegrated) family, as if all her training and accomplishments meant nothing if she was unable to bear children.