Sheikh `Atiyyah Saqr, former head of Al-Azhar Fatwa Committee, states that: “One of the intimate secrets that should never be revealed to others is that of a husband and wife’s sexual relationship. Imam Ahmad ibn Hanbal reports on the authority of Asma’ bint Yazid ibn As-Sakan that she was at the Prophet’s, including other men and women, while the Prophet (peace and blessings be upon him0 said: “There may be a man who reveals what happens (during intimate intercourse) between him and his wife; and there may be a woman who reveals what happens between her and her husband as well!” The people sank into deep silence and said nothing. But, I (Asma’) said: “By Allah, O Messenger of Allah! They (i.e. women) do this, and they (i.e. men) do the same.” The Prophet (peace and blessings be upon him) said: “Don’t ever do this, for this resembles a devil who meets a female devil and makes love with her in front of people.”
Also, Abu Sa`id Al-Khudri reports in the Sahih of Imam Muslim that Allah’s Messenger (peace and blessings be upon him) said: “Verily, among the most wicked persons in Allah’s Sight on the Day of Judgment is a man who makes love with his wife and then he (or his wife) reveals his partner’s secret to others.”
As far as other household affairs are concerned, they should never be revealed to others save to the parties concerned with the interest of the family. Honorable families are keen not to reveal their secrets even to the nearest of kin and friends. This is because a secret between more than two is no more a secret. Moreover, divulging one’s spouse’s secrets will surely hurt him/her badly. Unfortunately, many people try to hunt for others’ secrets and affairs out of mere curiosity. The Hadith of Umm Zar` is quite relevant in this respect.
However, one can reveal some of the secrets of one’s spouse to others if need be with the aim of seeking reconciliation or an interest such as in the case of the wife of Abu Sufyan (i.e. Hind) who complained to the Prophet (peace and blessings be upon him) that her husband (Abu Sufyan) was a miser. [By analogy, it is permitted in the court of law to reveal such things aiming at getting some kind of benefit or interest.]
However, it is forbidden to divulge such the secrets of household affairs to people who cannot help in solving the arising problems between a husband and his wife.”