Offences Against Women and Children
A man who has sexual intercourse with his own wife who is living separately (under a decree or otherwise), without her consent, is punished with 2-7 years' imprisonment plus fine.
This creates a specific offence for non-consensual sexual intercourse with an estranged, separated wife - a narrower category than full rape (given the general marital exception in Section 63), but still recognising that separation changes the legal consequences of non-consensual intercourse within a marriage.
This is why a husband who forces sexual intercourse on his wife specifically during a period of legal or de facto separation faces distinct criminal liability under this section, even though ordinary marital rape (where the couple is not separated) isn't independently criminalised as rape under Section 63.