Of the following which does not categorize under Rape? Sexual intercourse with -

Ref:Textbook of forensic medicine and toxicology (V.V.Pillay)17th edition page no.388 According to sec.375IPC coitus between man and wife also amount to rape if the wife is less than 15years of age, because law consider that, in view of her tender age and consequent immaturity of mind, the act may affect her body and mind adversely;hence the husband has no absolute right to coitus with her.