As-Salāmu `Alaykum (السلام عليكم):
The most disheartening feeling is when people interject their opinions verses providing the dalil (evidence) that is provided in Quran and Sunnah.
Islam has no need for our opinions or how we do things. What Allah has directed and the Sunna of Nabi Muhammad.
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The following is evidence of how the Prophet Muhammad (SAWS) answered the call of nature.
Milking the male private without shaking it until the fluid is totally relieved.
All Muslims sit while answering the call of nature.
If a male takes off all garments while answering the call of nature and stands nine of ten times fluids will touch the skin. If you are wearing garments you can not feel it and your garments are being stained.
What Prophet Muhammad (SAWS) said before answering call of nature
Sahih Bukhari Volume 1, Book 4, Number 144:
Narrated Anas:
Whenever the Prophet went to answer the call of nature, he used to say, "Allah-umma inni a'udhu bika minal khubuthi wal khaba'ith i.e. O Allah, I seek Refuge with You from all offensive and wicked things (evil deeds and evil spirits)."
How the Prophet Muhammad (SAWS) washed private parts after answering call of nature.
Sahih Buhari Volume 1, Book 4, Number 145:
Narrated Ibn 'Abbas:
Once the Prophet entered a lavatory and I placed water for his ablution. He asked, "Who placed it?" He was informed accordingly and so he said, "O Allah! Make him (Ibn 'Abbas) a learned scholar in religion (Islam)."
Sahih Bukhari Volume 1, Book 4, Number 152:
Narrated Anas bin Malik:
Whenever Allah's Apostle went to answer the call of nature, I along with another boy used to accompany him with a tumbler full of water. (Hisham commented, "So that he might wash his private parts with it.)"
Sahih Sahih Volume 1, Book 4, Number 153:
Narrated Anas:
Whenever Allah's Apostle went to answer the call of nature, I along with another boy from us used to go behind him with a tumbler full of water.
Sahih Bukhari Volume 1, Book 4, Number 216:
Narrated Anas bin Malik:
Whenever the Prophet went to answer the call of nature, I used to bring water with which he used to clean his private parts.
Sitting
Not facing the Qibla answering the call of nature
Sahih Bukhari Volume 1, Book 4, Number 147:
Narrated 'Abdullah bin 'Umar:
People say, "Whenever you sit for answering the call of nature, you should not face the Qibla or Bait-ulMaqdis (Jerusalem)." I told them. "Once I went up the roof of our house and I saw Allah's Apostle answering the call of nature while sitting on two bricks facing Bait-ul-Maqdis (Jerusalem) (but there was a screen covering him. ' (Fateh Al-Bari, Page 258, Vol. 1).
Using your left hand to touch and clean your private parts.
Sahih Bukhari Volume 1, Book 4, Number 156:
Narrated Abu Qatada:
The Prophet said, "Whenever anyone of you makes water he should not hold his penis or clean his private parts with his right hand. (And while drinking) one should not breathe in the drinking utensil ."
IF YOU POST PLEASE INCLUDE EVIDENCE (REFERENCE CITES) FROM QURAN AND THE SUNNAH OF PROPHET MUHAMMAD (SAWS) ON THREAD TOPIC. IT WILL HELP IN THE SPIRIT OF PROVIDING KNOWLEDGE ON THIS RELIGIOUS OBSERVANCE.