Background: Female Sex workers are at risk of obtaining sexually transmitted infections, particularly human immunodeficiency virus. Objectives: This study aimed at comparing the high-risk behaviours between regular and casual sex workers. Methods: This was a cross-sectional study conducted on sex workers from February to December, 2015, in a city of northern Iran. The research recruited 184 sex workers, who had the inclusion criteria. Three sampling methods were used to recruit the subjects. The test was conducted at an error level of 5% using the SPSS software.
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