In the name of Allah, Most Compassionate, Most Merciful,
Islam is a religion of modesty. It promotes modesty and shame in every act we do. In fact, modesty is something that differentiates a person from the animal. However, the issues of sexual behavior must be discussed and one should not shy away from learning about these matters as even the Sahaba (may Allah be pleased with them) would not shy away from asking questions about intimacy.
Our Prophet (saw) would also advise and teach people upon such matters despite being the most modest person the world has known. He would never be ashamed to teach the truth.
1. The first issue is regarding Oral Sex. Is it permissible?
There are differing views about this according to different scholars. Most of the Muslim scholars are of the opinion that oral sex is permissible (halal) but disliked. As long as it does not involve swallowing the semen it is okay.
This could be said as there is no clear evidence in Quran and Sunnah that forbids it.
Shedding some more light on the issue, as far as oral sex involves kissing the private parts where there is no involvement of swallowing the semen (Mani) or pre-ejaculatory fluid (Madhi) than it is permissible, although disliked. Also, the act must not be forced on anyone and must not cause harm.
However if by oral sex means to swallow the filth, it is not permissible. The filth in all forms taken in a mouth is unlawful. These fluids are impure thus taking them orally is not permissible. If the same act is performed using a condom and filthy fluids are avoided then there is no problem in that.
In conclusion, It is not prohibited and is not haram but due to the nature of this act it is not considered to be a proper conduct of a Muslim, The mouth that is used in the Dikhr of Allah, recite Quran and send salutations on Prophet Muhammad (saw), cannot be used in such filthy and dirty practices and should be avoided. A Muslim of high morality and conduct will not imitate a non-Muslim and will avoid it.
2. The second issue is regarding Anal Sex. Is it permissible?
There is no question in the fact that anal sex is totally prohibited in Islam. As Allah azawajal mentions in holy Quran clearly: “Say: They are hurt and a pollution; so keep away from women in their courses and do not approach them until they are clean. But when they have purified themselves ye may approach them in a manner, time, or place ordained for you by Allah. For Allah loves those who turn to Him constantly and he loves those who keep themselves pure and clean.” (Quran, 2:222)
One may find many narrations regarding this issue of Messenger of Allah (saw) that forbid it straight away. “The one who has intercourse with his wife in her anus has disavowed himself of that which was revealed to Muhammad ﷺ.” (Abu Dawud) “Allah will not look (with mercy) at the one that has anal sex with his wife” (meaning on the day of Qiyamah). (Sunan Nasa’i) “Allah will not look at a man who has intercourse with a woman in her anus.” (Tirmidhi)
“Allah is not too shy, to tell the truth,” three times. “Do not have intercourse with women in their back passages.” (Ibn Majah)
“Sunan of Abu-Dawood Hadith 2157 Narrated by Abu Hurayrah: The Prophet (saw) said: the who has intercourse with his wife through her anus is accursed.”
“Sunan of Abu-Dawood Hadith 3895 Narrated by Abu Hurayrah: The Prophet (saw) said: If anyone resorts to a diviner and believes in what he says, or has intercourse with his wife when she is menstruating or has intercourse with his wife through her anus, he has nothing to do with what has been sent down to Muhammad (saw)!”
In conclusion, it is totally haram and must be abstained from. May Allah guide us.
3. Sex during menstruation (Haidh)
The Quran and clearly prohibited the intercourse of a husband and a wife during menstruation. Allah Azawajal says in Holy Quran: “They ask you (O Prophet) regarding menstruation. Say It his hurtful and impure. So abstain from women (sexually) in menstruation.” (Sura al-Baqarah, V.222) Also In numerous hadith, it is mentioned that intercourse during menstruation is unlawful. The Prophet (saw) said: “Approach from the front or the back, but avoid anal sex and sex during menstruation.” (Tirmidhi) Hence it is unlawful and must be avoided.
May Allah guide us and protect us.