مسائل المنتخبه (Articles Of Islamic Acts) - الخوئي، السيد أبوالقاسم - الصفحة ١٥ - The Use of Lavatory

so as to avoid somebody seeing him or her, or when there is an unavoidable excuse for sitting thatway, it is permissible to do so.
٦٣. Obligatory precaution lies in this that a child should not be made to sit for evacuating his/her bowels or bladder in such a way that his/her face or back maybe opposite the holy Kabah. However, if the child himself/herself sits in such a way it is not obligatory to restrain him/her from doing so.
٦٤. It is prohibited (Haram) to evacuate ones bowels or bladder at the following four places: (i) In blind alleys without the permission of the people of thosealleys. (ii) In the property (land) of a person who has not granted permission for its use for this purpose. (iii) At a place which is reserved for a particular group (e.g.school, hostel, orphanage etc.). (iv) On the graves of the believers or at the sacred places whose use for these purposes amount to their desecration.
٦٥. In the following three cases anus can be purified only with water: (i) If another impurity also comes out along with the faeces. (ii) If an external impuritytouches the anus. (iii) If more than usual impurity spreads on the anus. In the cases other than those mentioned above, anus can be purified either by water or by usingtissue paper, cloth or stone etc., although it is better to wash it with water. (for details: see Article ٦٨ - ٧٠).
٦٦. The urinary organ cannot be purified without water. It would suffice if after washing the original impurity the urinary organ is washed once with Kurr water orwith running water. However, in the case of under-Kurr water the obligatory precaution is to wash it twice and it is still better to wash it thrice.
٦٧. If the anus is washed with water it is necessary that no trace of faeces should be left on it. However, there is no harm if its color and smell remaining there.And if it is washed in such a way in the first instance that no particle of stool remains there it is not necessary to wash it for the second time.