It is clear that the Bahá'í teachings call for an absolute
standard of fidelity in the relationship between husband and wife. An excerpt
from a letter dated 28 September 1941 to an individual believer written on
behalf of Shoghi Effendi, quoted in "Messages from the Universal House of
Justice, 1968-1973", page 108, states:
The question you raise as to the place in one's life that a
deep bond of love with someone we meet other than our husband or wife can have
is easily defined in view of the teachings. Chastity implies both before and
after marriage an unsullied, chaste sex life. Before marriage absolutely
chaste, after marriage absolutely faithful to one's chosen companion. Faithful
in all sexual acts, faithful in word and in deed.
- The Universal House of Justice (From a letter date 22 July
1987 written on behalf of the Universal House of Justice to an individual
believer; The Compilation of Compilations, vol. I, Preserving Baha’i Marriages)
