Purity: Disapproved Acts While Relieving Oneself
Practical Laws of Islam as per the teaching of Ayatullah Sistani
Ruling 76
It is disapproved for one to face the sun or the moon when he is emptying his bowels and/or bladder. However, if he covers his private parts by some means, it is not disapproved. It is also disapproved to empty one’s bowels and/or bladder while facing the wind, on roads and streets, in alleyways, in front of the door of a house, and under fruit-yielding trees. Furthermore, while one is emptying his bowels and/or bladder, it is disapproved to eat, take a long time, and wash with the right hand. It is also disapproved to talk while one is emptying his bowels and/or bladder; there is no problem, however, if one is compelled to talk or if one is remembering Allah the Exalted (saying dhikr).
-Ayatullah Sistani, Practical Laws of Islam, Purification (Taharah)