As Muslims we are required to shave pubic
hair.
For a man, is this all the hair between his navel and his knees ? (i.e. all hair on the
lower abdomen and thighs)

Praise be to Allaah.

Al-Haafiz said in al-Fath (10/343):

Al-Nawawi said: what is meant by al-‘aanah is the hair which is
above and around the man’s penis, and the hair around the woman’s vagina. It was
reported from Abu’l-‘Abbaas ibn Surayj that it is the hair that grows around the
back passage. From all of this, we may understand that it is mustahabb to shave all the
hair from the front and back and all around them. Shaving is mentioned because this is the
most common method, but it is also permissible to remove hair by waxing, plucking, etc.

Abu Shaamah said: al-‘aanah is the hair that grows on the rakab,
which is what is underneath the bulge of the abdomen and above the private parts. Or it
was said that it is the exterior of the private parts; or the private part itself, whether
of a man or a woman. It is mustahabb to remove the hair from the front and back, indeed it
is more important to remove the hair from the back, lest any faeces get stuck to it and
cannot be removed by cleaning it with water or with stones, tissues, etc. Depilatory
agents (waxing, sugaring, etc.) may be used instead of shaving, or the hair may be plucked
or cut. Ahmad was asked about removing the pubic hair with scissors. He said, “I hope
this will be good enough.” He was asked, “What about plucking?” He said,
“Could anyone do that?” Ibn Daqeeq al-‘Eed said: the scholars of the Arabic
language said: “al-‘aanah is the hair that grows around the private part, or it
was said that it is where the hair grows. This is what was meant in the report. Abu Bakr
ibn al-‘Arabi said: The pubic hair is the body hair which it is most important to
remove, because it grows thick and dirt gets trapped in it. Ibn Daqeeq al-‘Eed said:
it is as if those who said it is mustahabb to shave the hair around the back passage
mentioned this by way of analogy.

And Allaah knows best.