Foreplay with one’s wife using one’s finger
Is it permissable for the husband to insert his finger into his wife's vagina and to fondle it during intercourse.
الإجابة:
Praise be to Allaah.
I do not see any reason not to do that, so long as it is done with the left hand.
Shaykh ‘Abd al-Kareem al-Khudayr.