As regards the issue of oral sex, it is to be noted, first of all, that 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 or post natal bleeding. Thus, it is permissible for a husband and a wife to practice cunnilingus and fellatio consensually. This may be disgusting to some spouses since it does not conform to the pure taste and decency of a Muslim personality, although, it is not haram.
Responding to this in more detail, an 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).
These parts are not dirty like anus, but it is ordinarily disgusting to man. But there is no decisive evidence to make it unlawful, especially if the wife agrees with it or achieves orgasm by practicing it. Allah, Exalted and Glorified be He, says: “And who guard their modesty, save from their wives or the slaves, that I heir right hands possess, for then they are not blameworthy, but Who so craves beyond that, such are transgressors.” (Al-Mu’minun: 5-7)
In the light of this, scholars maintain that the husband is allowed to enjoy his wife through any means of enjoyment except anal sex, for that is strictly forbidden.
Dr. Ali Jum`ah 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, as it’s the case in the Western perverted ideology.
Shedding more light on this, Dr. Sabri `Abdul Ra’ouf 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. He also gives support to the view of Sheikh Al-Qaradawi that oral sex or kissing private parts of the spouse is something viewed disgusting to Muslims, but if the aim is just kissing (without having constant indulgence in it) it’s not sinful to do that, but people of high morality normally keep away from that, as not to give in to imitating non-Muslims.”
In conclusion, it has become clear now that oral sex is not prohibited, but it is not the normal choice for committed Muslims and Muslimahs.
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. Also, if the wife feels disgusted about this act, the husband should not force her doing it.