Expense.  As alluded to in Counterargument Four above, sexual offences are typically committed within relationships, or by someone the victim knows; around 80% according to some studies1. These proportions are also probably larger, in that rape by an acquaintance is less likely to be reported, as a victim is better able to normalise the incident as a misunderstood sexual interaction.  This indicates that a deterrent effect is less likely to work, because of the lower chance of the offence being reported, and the relative power within any such relationship. The offender is less likely to respond to that deterrent, as they perceive it as so unlikely to occur to them.  1 National Center for Victims of Crime, "Acquaintance Rape", 2008,