Study: NCT04349748

Intervention type: BEHAVIORAL
Group type: EXPERIMENTAL
Intervention: Health education, and regular HIV and STDs testing prompting service
Description: Health education through app for once a week, and regular HIV and STDs testing prompting service (every month through app) are given to the participants at the beginning of the study and last for the whole five observation periods.

Intervention type: BEHAVIORAL
Group type: EXPERIMENTAL
Intervention: Health education, and regular HIV and STDs testing prompting service
Description: Health education through app for once a week, and regular HIV and STDs testing prompting service (every month through app) are given to the participants at the beginning of the study and last for the whole five observation periods.

Intervention type: BEHAVIORAL
Group type: EXPERIMENTAL
Intervention: Health education, and regular HIV and STDs testing prompting service
Description: Health education through app for once a week, and regular HIV and STDs testing prompting service (every month through app) are given to the participants at the beginning of the study and last for the whole five observation periods.

Intervention type: BEHAVIORAL
Group type: EXPERIMENTAL
Intervention: Health education, and regular HIV and STDs testing prompting service
Description: Health education through app for once a week, and regular HIV and STDs testing prompting service (every month through app) are given to the participants at the beginning of the study and last for the whole five observation periods.

Intervention type: BEHAVIORAL
Group type: EXPERIMENTAL
Intervention: Health status inquiry through app (partner notification)
Description: The permission to query health status through app (partner notification) is given to participants (participants can query their potential sexual partner's status of HIV, syphilis, hepatitis B, and hepatitis C respectively through app) at the specific observation period,and the permission is retained until the end of study.

Intervention type: BEHAVIORAL
Group type: EXPERIMENTAL
Intervention: Health status inquiry through app (partner notification)
Description: The permission to query health status through app (partner notification) is given to participants (participants can query their potential sexual partner's status of HIV, syphilis, hepatitis B, and hepatitis C respectively through app) at the specific observation period,and the permission is retained until the end of study.

Intervention type: BEHAVIORAL
Group type: EXPERIMENTAL
Intervention: Health status inquiry through app (partner notification)
Description: The permission to query health status through app (partner notification) is given to participants (participants can query their potential sexual partner's status of HIV, syphilis, hepatitis B, and hepatitis C respectively through app) at the specific observation period,and the permission is retained until the end of study.

Intervention type: BEHAVIORAL
Group type: EXPERIMENTAL
Intervention: Health status inquiry through app (partner notification)
Description: The permission to query health status through app (partner notification) is given to participants (participants can query their potential sexual partner's status of HIV, syphilis, hepatitis B, and hepatitis C respectively through app) at the specific observation period,and the permission is retained until the end of study.