Most often, there will be no prosecution for a victim of rape unless the victim experienced a very high level of violence. There have been many problems with prosecuting the perpetrators of spousal rape, chief amongst them has been the reluctance of the various legal systems to recognize it as a crime at all. For example, in the United Kingdom, rape by one’s spouse was recognized by a 1991 House of Lords decision known simply as "R v R (1991 All ER 481)". While most parties agreed with the House of Lords' motive in making the decision, there were many who were of the opinion that the decision involved "post facto" criminalization, since the House of Lords were imprisoning spouses for doing what was once, according to the law, their right.