Recently, and mostly within the United States, the use of the term safer sex rather than safe sex has gained greater use by health workers, with the realization the grounds that risk of transmission of sexually-transmitted infections in various sexual activities is a continuum rather than a simple dichotomy between risky and safe. However, in most other countries, including the United Kingdom and Australia, the term safe sex is still mainly used by sex educators. Because these terms are virtually synonymous with each other, they will be used interchangeably throughout this article.