The sexual revolution refers to the well documented changes in social thought and codes of behaviour related to sexuality throughout the Western world that continues to evolve. In general use, the term "sexual revolution" is used to describe a socio-political movement, witnessed from the 1960s to the 1980s and maybe we can still feel the effects and side-effects of it nowadays. However, the term has been used at least since the late 1920s and is often attributed as being influenced by Freud's writing on sexual liberation and pychosexual issues. During the 1960s and 1970s, shifts in regards to how society viewed sexuality began to take place, heralding a period of de-conditioning in some circles away from old world antecedents, and developing new codes of sexual behavior, many of which are now integrated into the mainstream. While the extent to which the sexual revolution involved major changes in sexual behavior is debated, many observers suggest that the main change was not that people had more sex or different types of sex, it was simply that they talked about it more openly than previous generations had done - which in itself can be described as revolutionary by supportive historians.