Background. To evaluate whether Chinese men who have sex with men (MSM) selectan STI test (rectal vs urethral) appropriate for their sexual behavior (insertive and/orreceptive).Methods. We studied uptake of gonorrhea and chlamydia testing among ChineseMSM (N=431) in a multi-site randomized controlled trial (RCT) (December 2018 toJanuary 2019). We collected socio-demographics, relevant medical and sexual history,and disclosure of sexual behavior (outness). Drawing data from the RCT, we estimatedthe decision to test and test choice, and the extent to which disclosure plays a role indecision-making. Results. Among 431 MSM, mean age was 28 years (SD=7.10) and 65% were outto someone. MSM who indicated versatile sexual behavior and were out to someone hada 26.8% (95%CI=6.1, 47.5) increased likelihood for selecting the rectal test vs the ure-thral test, compared to those versatile and not out. Versatile MSM out to their healthprovider outside of the study context had a 29.4% (95%CI=6.3, 52.6) greater likelihoodfor selecting the rectal STI test vs the urethral test, compared to versatile MSM not outto their health provider. Conclusions. Sexual behavior and outness may affect gonorrhea and chlamydia test-ing provision. Apart from clinicians, community-based efforts may reduce stigma-basedbarriers to testing. Keywords. MSM; Sexual Health; Sexual Behavior Disclosure; China