Mustahab[1] and Makrooh[2] acts

79. It is Mustahab that a person sitting for relieving himself, sits at a place where no one would see him, and enters the toilet with his left foot forward, and comes out with his right foot. It is also Mustahab to cover one's head, and to place one's weight on the left foot.

Istibra

Rules concerning use of lavatory

Urination and Excretion

57. It is obligatory to conceal one's private parts in the toilet and at all times from adult persons (Mukallaf) even if they are one's nearest relatives like mother and sister, similarly, it is obligatory to conceal one's private parts from insane persons, and from children who can discern between good and evil. However, husband and wife are exempted from this obligation.