Praise be to Allah.
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 Allaah 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-Mu’minoon 23:5-7]
(Fataawa al-Mar’ah by Ibn ‘Uthaymeen, 121).
Al-Bukhaari reported in his Saheeh (no. 250) that ‘Aa’ishah said: “The Prophet (peace and blessings of Allaah be upon him)and I used to bathe from one vessel.”
Al-Haafiz said in al-Fath: “Al-Daawoodi interpreted this to mean that it is permissible for a man to look at his wife’s ‘awrah and vice-versa. This is supported by the report narrated by Ibn Hibbaan via Sulaymaan ibn Moosa, who was asked about a man looking at his wife’s private parts. He said: ‘I asked ‘Aa’ishah, and she referred to this hadeeth.’ This is evidence in this matter. And Allaah knows best.”
I say: as for the words that some people attribute to the Prophet (peace and blessings of Allaah be upon him), that it is makrooh (disliked) for a man to look at his wife’s private parts, this is not saheeh. This includes the reports narrated from Ibn ‘Abbaas and Abu Hurayrah according to which the Prophet (peace and blessings of Allaah be upon him) said, “When any one of you has intercourse with his wife, let him not look at her private parts, because this causes blindness, and let him not speak, because this causes muteness.” Ibn al-Jawzi said: “(This is) mawdoo’ (fabricated).”
(See al-Mawdoo’aat by Ibn al-Jawzi, 2/271-272).
And Allaah knows best.