Sterilization (medicine)
In medicine, sterilization was a process which rendered someone unable to reproduce.

In 2268, Hodin explained that as the Gideon birth rate continued to rise and the population grew, their planet  became encased in a living mass incapable of finding rest, peace, or joy. Captain James T. Kirk asked why they hadn't introduced new techniques to sterilize men and women, but Hodin responded that it would be impossible because their organs renewed themselves. ()

See also 
 Infertility
 Sterility

External link  
 

Medicine
Sex and reproduction