This made me think about the laws in Australia. They are the same:
Section 349 Criminal Code of Queensland
(1) Any person who rapes another person is guilty of a crime.
Maximum penaltyólife imprisonment.
(2) A person rapes another person ifó
(a) the person has carnal knowledge with or of the other person without the other personís consent; or
(b) the person penetrates the vulva, vagina or anus of the other person to any extent with a thing or a part of the personís body that is not a penis without the other personís consent; or
(c) the person penetrates the mouth of the other person to any extent with the personís penis without the other personís consent.
(3) For this section, a child under the age of 12 years is incapable of giving consent.
So based the law in my country my brother offically raped me at 5. Yay! (Sarcasm)