Section 390 - Incest.

Whoever being a man has sexual intercourse with a woman who is and whom he knows or has reason to believe to be his daughter, his grand-daughter, his mother or any other of his female ascendants or descendants, his sister or the daughter of his brother or sister or his paternal or maternal aunt and whoever being a woman voluntarily permits a man who is and whom she knows or has reason to believe to be her son, her grandson, her father or any other of her male ascendants or descendants, her brother or the son of her brother or sister or her paternal or maternal uncle to have sexual intercourse with her, shall be punished with imprisonment for a term which may extend to seven years and shall also be liable to fine.

Explanation

In this section words expressing relation include relatives of the half blood and relatives whose relation is not traced through a lawful marriage.