Reforms of marital rape laws in the United States began in the mid-1970s with the criminalization of marital rape. The earlier laws of the 1970s often required the husband and wife to no longer be living together for marital rape charges to be brought. The case in the United States that first challenged this cohabitation clause was "Oregon v. Rideout" in 1978. Although the husband was acquitted of raping his wife, it spurred the movement towards reform. By 1993 marital rape was a crime in all 50 states. Still, in the 1990s, most states continued to differentiate between the way marital rape and non-marital rape was viewed and treated. The laws have continued to change and evolve, with most states reforming their laws in the 21st century. But there are still states, like South Carolina, where marital and non-marital rape are treated quite differently under the law.