Which of the following comes under definition of rape, even if consent is given -

Ref: Textbook of forensic medicine and toxicology( V.V.Pillay)17th edition page no.388 As per sec.375IPC any unlawful sexual intercourse by man with a woman with or without her consent when she is under 18years of age. And also coitus between man and his wife amounts to rape if the wife is less than 15 years of age,because in view of her tender age and consequent immaturity of mind, the act may affect her body and mind adversely.