Comments on the Irish age of consent to sexual activity rules under the Criminal Law (Sexual Offences) Act 2006, including: (1) its definition of a "sexual act"; (2) whether setting the age of consent at 17 reflects the reality of teenagers' sexual practices; (3) the extent to which the Act recognises underage, non-abusive sexual relationships between near-age peers as a form of liability distinct from sexual abuse of a child by an adult; and (4) the questionable constitutionality of s.5 which exempts girls, but not boys, from prosecution for underage penile-vaginal sex. Suggests ways in which the law might be reformed.