Table 1 The characteristic of high-risk sexual behavior among MSM

The numbers of men have had sex with^a

  < 10

   ≥ 10

Using of condoms during having sex with men^a

 Never use

 Sometimes use

 Use every time

Had commercial sex with men^a

 No

 Yes

Had group sex with men^a

 Never

 Occasionally

 Frequently

The HIV status of the male sexual partner^a

 HIV negative

 Unclear

 HIV positive sexual partner and receiving antiviral therapy

 HIV positive sexual partner and not receiving antiviral therapy

Used drugs^a

 Yes

 No

Had STDs^a

 Yes

 No