The husband also admitted sharing intimate photographs or film of his wife, without her consent, for sexual gratification.
He denies 11 counts of rape, two counts of attempted rape, seven counts of assault by penetration, four counts of sexual assault, four counts of conspiracy to rape, three counts of conspiracy to assault by penetration, one count of conspiracy to administer a substance with intent and one count of administering a substance with intent.
A further preliminary hearing will be held at Manchester Minshull Street Crown Court on 24 August, a week ahead of the scheduled 12-week trial.