February 6. On this date in 1973, the Universal House of Justice wrote "The Bahá'í teaching on sexual intercourse is very clear. It is permissible only between a man and the woman who is his wife...."

February 6. On this date in 1973, the Universal House of Justice wrote (also here) "The Bahá'í teaching on sexual intercourse is very clear. It is permissible only between a man and the woman who is his wife...."

1158. Sexual Intercourse Permissible Only Between Man and Wife
"The Bahá'í teaching on sexual intercourse is very clear. It is permissible only between a man and the woman who is his wife...."
(From a letter of the Universal House of Justice to all National Spiritual Assemblies, February 6, 1973; excerpt from a letter in response to questions from an individual believer: Ibid.)

Also here...

1215. Chastity Should Be Strictly Practiced by Both Sexes
"The Bahá'í teaching on sexual intercourse is very clear. It is permissible only between a man and the woman who is his wife. In this connection we share with you extracts from four letters written on behalf of the Guardian which throw light on various aspects of the matter...."
(From a letter of the Universal House of Justice to all National Spiritual Assemblies, February 6, 1973)