(2) Can the husband touch her between the navel and the knee, if they know that this would not leed to intercourse? (3)Can the husband masturbate her?
The area between the navel and the knee of the wife is prohibited upon the
husband during menses.
It is not permissible for the husband to derive pleasure from that area even
if he is sure that intercourse will not take place. The above ruling
includes the prohibition of masturbation.
and Allah Ta’ala Knows Best
Mufti Ebrahim Desai