Catholic Church Per Canon 1084 §3 "Without prejudice to the provisions of Canon 1098, sterility- the absolute or probable inability to have children due to defects or abnormalities in the reproductive organs or other associated organs, or of the germ cells (the ova and sperm), neither forbids nor invalidates a marriage." Both parties, however, must be physically capable of completed vaginal intercourse, wherein the man ejaculates "true semen", even if the amount is small and/or if there are no viable sperm, into the woman's vagina (even if the cervix or uterus are absent, the ova are absent or non-viable, or the vagina is deformed). (See for details.) To invalidate a marriage, the impotence must be perpetual (i.e., incurable) and antecedent to the marriage. The impotence can either be absolute or relative. This impediment is generally considered to derive from divine natural law, and so cannot be
dispensed. The reason behind this impediment is explained in the
Summa Theologica: "In marriage there is a contract whereby one is bound to pay the other the marital debt: wherefore just as in other contracts, the bond is unfitting if a person bind himself to what he cannot give or do, so the marriage contract is unfitting, if it be made by one who cannot pay the marital debt." == By country ==