Contraceptive measures that lead to male sterility, are not ever permitted for their interfering with a man's obligation, only ever being permitted in life-threatening circumstances for the man such as some forms of cancer. For example, a crushed or mangled man may not be permitted to marry anyone but a convert under Jewish law, and halachic authorities see vasectomy as a form of maiming, even if already married to a non-convert becoming maimed intentionally or accidentally including a vasectomy does obligate divorce unless a successful repair surgery is performed and sperm flow is returned (based on Deuteronomy ).