China implemented many measures to control COVID-19. This study analyzed the number and trend of reported HIV and AIDS cases from 2017 to 2020. They found that in January 2020, when these measures started in China, there were fewer HIV and AIDS cases reported than counterfactual. They estimated that many cases were not diagnosed or not reported in some provinces. Health departments should improve and maintain their surveillance and reporting systems during pandemics, such as COVID-19.

This study explored the impact of HIV serostatus disclosure on multiple sexual partners and condomless anal intercourse among HIV-negative MSM. Regular HIV testing promoted serostatus disclosure, and disclosure of HIV serostatus was associated with fewer sexual partners. However, among MSM with casual partners, disclosure was associated with a higher likelihood of engaging in condomless anal intercourse. These findings highlight the importance of regular HIV testing and disclosure in managing sexual health.

In the United States, medical residents and fellows may encounter challenges when counselling adolescents about sexual health. This study explores the association of residents’ and fellows’ demographics, medical training, personal adolescent sexual healthcare experiences, with confidence in STI management and confidential care for adolescents. Findings highlight the pressing need for communication training to address gaps in confidence.

There is a co-occurrence between substance use and sexual practices in adolescence, with important health impacts. Girls, sexual minorities, and native-born students are more vulnerable to engaging in this practice. Moreover, substance users in sexual contexts are more likely to engage in risky behaviours, such as having multiple partners, inconsistent condom use, and ineffective contraception, leading to increased risk of STIs and unintended pregnancies. More longitudinal studies are needed to identify their motives, predisposing factors and design public health measures.

Our recent study in Jiangxi Province, China, highlights the significant link between sexting and high-risk sexual behaviors among college students, with 12.7% reporting sexting and 11.0% of students reporting high-risk behaviors. The research underscores that students who have engaged in sexting are significantly more likely to partake in risky behaviors, such as unprotected sex, multiple sexual partners, casual sex and commercial sex. This calls for enhanced sexual health education and safety measures to curb these risky behaviors among college students.