When sentencing offenders for sexual intercourse with young persons under s 70(1)(a) of the Criminal Codification and Reform Act, courts must properly apply all three elements of the sentencing triad: the crime, the offender, AND the interests of society. It is insufficient for a sentencing court to merely acknowledge public policy concerns such as deterrence, prevalence, and protection of vulnerable persons in its reasons for sentence without carrying those considerations through to the actual sentence imposed. The interests of society require courts to consider: (a) whether the sentence offers sufficient deterrence in view of the current prevalence of the offence; (b) whether the sentence properly addresses public concerns that courts are serious about the issue; and (c) whether the court is properly discharging its obligation to protect vulnerable members of society. A manifestly lenient sentence that fails to reflect these considerations, such as a nominal fine and inadequate suspended sentence, constitutes a failure to properly exercise sentencing discretion and warrants withholding of the certificate on review.