SHAVING THE PRIVATE PARTS
Q. If we have to shave our private parts does this mean hair on the rear end? And isnt that a bit difficult?
As far as I know, the noble fuqaha’ have stated that 1) hair on the actual private part; 2) hair around the private part and 3) hair above the private part ought to be removed. This therefore includes hair from the scrotum. In the Maraqi al-Falah it states:
“It is highly recommended to remove hair from the backside out of fear that any filth coming out will attach itself to it…
ويستحب إزالة شعر الدبر خوفا من أن يعلق به شيء من النجاسة الخارجة…
From this, it would mean that if it is not too difficult for someone to do, then any hair that can be removed that is located between the penis and anus must be removed.
And Allah knows best.
 Imam al-Shurunbulali, Maraqi al-Falah, p.527.