US Department of Health and Human Services, Centers for Disease Control and Prevention
https://www.lgbthealtheducation.org/wp-content/uploads/COM-827-sexual-history_toolkit_2015.pdf
US Department of Health and Human Services, Centers for Disease Control and Prevention
https://www.lgbthealtheducation.org/wp-content/uploads/COM-827-sexual-history_toolkit_2015.pdf