All acts that aim at satisfying and pleasing the spouses are allowable so long as two things are avoided, that is anal sex and having sex with a wife while she is still in her menstruation. Thus, it is permissible for a husband and a wife to practice cunnilingus (Oral stimulation of the clitoris or vulva) and fellatio. Following we’d cite the opinions of some well-known Muslim scholars in this regard:
The eminent Muslim scholar, Sheikh Yusuf Al-Qaradawi states: “Muslim jurists are of the opinion that it is lawful for the husband to perform cunnilingus on his wife, or a wife to perform the similar act for her husband (fellatio) and there is no wrong in doing so. But if sucking leads to releasing semen, then it is Makruh (blameworthy), but there is no decisive evidence (to forbid it).”
Dr. Ali Jum`ah, professor of the Principles of Islamic Jurisprudence at Al-Azhar Univ., says further that licking, sucking and kissing spouse’s sexual organs are all allowed, as long as it gives a person sexual gratification that will keep him away from Haram (unlawful) or starring at opposite sex (marriageable). But every Muslim must keep in mind that sexual intercourse is just a lust and passion that must be satisfied in a lawful way; it’s not to be perceived as necessary as foods and drinks.
Shedding more light on this, Dr. Sabri `Abdul Ra’ouf, professor of Islamic Comparative Jurisprudence, at Al-Azhar Univ, says that it’s allowed for the married couple to enjoy each other as long as what they do does not run counter to the teachings of Islam or violate the public norms.
In conclusion, it has become clear now that oral sex is not prohibited.
Here, it should be noted that one of the main objectives of Shari`ah is to safeguard the life of people and keep them healthy. Based on this, if it is scientifically proven that oral sex or such practices cause mouth cancer or form a danger on the health of a person who practices it, then it becomes totally prohibited.