Their uncertainty turned into arguments and emotional distance. To Michael, the circumstances seemed impossible to explain. To Sarah, the accusations were deeply painful. Neither realized that there was a medical explanation they had not yet considered.
A vasectomy is one of the most effective permanent contraceptive methods, but it is not 100% effective. According to the CDC, after semen analysis confirms that sperm are absent or only rare nonmotile sperm remain, the estimated pregnancy risk is approximately 1 in 2,000. Before confirmation, another contraceptive method is generally necessary because sperm can remain in the reproductive tract.
