In some of these instances of rape to punish adultery, they don't even try and arrest the rapists.
In others I've heard, the accusation of adultery to 'justify' the rape may have been false. So a woman is falsely accused of cheating on her husband, is gang raped as punishment, and then punished again by the system whether by caning, imprisonment or possibly even death by stoning. Yeah, they throw rocks at her until she dies.
What an enlightened culture.....