There is no such thing as marital rape, per the legal definition of rape.
Rape. A male who has sexual intercourse with a female not his wife is guilty
of rape if:
(a) he compels her to submit by force or by threat of imminent death, serious
bodily injury, extreme pain or kidnaping, to be inflicted on anyone; or
(b) he has substantially impaired her power to appraise or control her conduct
by administering or employing without her knowledge drugs, intoxicants or
other means for the purpose of preventing resistance; or
(c) the female is unconscious; or
(d) the female is less than 10 years old.
(SOURCE) PDF