Intercourse does not break fasting?

Question:

Some opponents claim that according to Imam As-Sadiq (a.), fasting is valid after having completed intercourse from behind. Is this the truth?

Answer:

The innovators have lied. There is ghusl if there has been orgasm.

Al-Hasan Ibn Mahbub reported that he asked Imam As-Sadiq (a.): “What is the case when the man enters into the woman’s buttocks while she is fasting?” He said: “Their fasting will not be invalidated and the whole body wash (ghusl) is not obligatory for them.” Al-Barqi reported that Imam As-Sadiq (a.) said: “If the man penetrates the buttocks of the woman and no orgasm is reached, then they are not obliged to perform a full body wash, and if the man reaches the orgasm, then he is obliged to perform a full body wash, while the woman is not obliged to perform a full body wash (ghusl).” Al-Halabi reported that Imam As-Sadiq (a.) was asked: “What is the situation when the man interacts with the woman without the involvement with the womb? Is she obliged to perform a full body wash if he reaches the orgasm while she did not reach the orgasm?” He said: “She is not obliged to do a full body wash and if he does not reach a orgasm, then he is not obliged to do a full body wash (ghusl) either.” [Al-Hada’iq-un-Nadirah by Yusuf Al-Bahrani, Volume 3 Pages 8 – 9]

ما رواه الشيخ في الصحيح عن ابن محبوب عن بعض الكوفيين رفعه إلى أبي عبد الله عليه السلام في الرجل يأتي المرأة في دبرها وهي صائمة؟ قال: لا ينقض صومها وليس عليها غسل. ما رواه الكليني والشيخ في الصحيح عن البرقي رفعه عن أبي عبد الله عليه السلام قال: إذا أتى الرجل المرأة في دبرها فلم ينزل فلا غسل عليهما، وإن أنزل فعليه الغسل ولا غسل عليها. واستدل على القول الثاني أيضا بوجوه (أحدها) – صحيحة الحلبي قال: سئل أبو عبد الله عليه السلام عن الرجل يصيب المرأة فيما دون الفرج أعليها غسل إن هو أنزل ولم تنزل هي؟ قال: ليس عليها غسل، وإن لم ينزل هو فليس عليه غسل

Even more interesting are the books of our enemies.

Examples:

Yahya Ibn Sharaf An-Nawawi writes: “Imam Abu Hanifah says the same thing about homosexual intercourse as in our school of law, and about the one with animals he says: “When you have reached the orgasm, your fast becomes invalid, and if you have not reached it, it does not become invalid.” [Al-Majmu’, Volume 5 Page 349]

قال يحيى بن شرف النووي: قال أبو حنيفة في اللواط كمذهبنا وقال في البهيمة إن أنزل بطل صومه وإلا فلا

Fakhr-ud-Din Al-Farghani writes: “If one has intercourse with an animal or a dead person, and has not reached the orgasm, then his own fasting is not invalid and one is not obliged to perform a full body wash (ghusl).” [Fatawa Qadi Khan, Volume 3 Page 192]

قال فخر الدين الفرغاني: وإذا أولج بهيمة أو ميتة ولم ينزل لا يفسد صومه ولا يلزمه الغسل