Assertion: vasectomy's semen | /r/HasProperty | declared sperm-free
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Source sentences:
text: If recanalization happens late (months or years after a man's semen has been examined and declared sperm-free), an unplanned pregnancy could result; but the odds of this occurring is far less after vasectomy than the odds of pregnancy with any other form of birth control including birth control pills and tubal ligation (female sterilization).