It is permissible for a woman to see all of her husband’s body and for a man to see all of his wife’s body, with no need to go into details, because Allah says (interpretation of the meaning): “And those who guard their chastity (i.e., private parts, from illegal sexual acts), except from their wives or (the captives and slaves) that their right hands possess, – for then, they are free from blame; but whoever seeks beyond that, then those are the transgressors.” [al-Muminun 23:5-7] (Fatawa al-Mar’ah by Ibn ‘Uthaymin, 121)