What is the ruling regarding the removal of pubic hair for males and females?

All the hair from below the navel should be removed, whether on the right, left, on the testicles, etc. This should be done weekly, fortnightly, or at least every forty days. If the hair is not removed within a forty-day period, then one will be guilty of perpetrating an act that is Makrooh-e-Tahreemi (extremely abhorrent and close to Haraam). [Re:- Fataawa Mahmoodiyya pg.473 vol.27].

The famous view is that it is not necessary to remove the hair of the hind private part, as it is necessary for one to remove the pubic hair. Allama Tahtaawi has considered the removal of the hair on the hind private part to be Mustahab and not necessary. However, the view of Allama Shaami is that removal of these hairs is even more emphasized than that of the pubic hair. In other words, when it is necessary and important to remove pubic hair, it will be all the more important to remove the pubic hair of the hind private part, so that impurity does not remain attached to the hair. [Re:- Ahsanul Fataawa Pg.78 Vol.8]

The Salaah of a person will be valid even though one may have been careless in removing the pubic hair with the proviso that no impurity remains on the hair.