Participants will be asked to indicate their past 7-day mood; stress experiences; and mental and behavioral health on an online survey experience once per week for 10 weeks

Depression will be measured using the Patient Health Questionnaire-9 (PHQ-9). A sum score of 9 items indicates depression severity, with higher scores indicating higher severity and a scores ranging from 0-27. A 10th item indicates functional impairment. A cutoff score of 7 or more indicates high likelihood of a depressive episode.

Anxiety will be measured using the Generalized Anxiety Disorder-7 scale (GAD-7). A sum score of 7 items indicates anxiety severity, with higher scores indicating higher severity and scores ranging from 0 to 21. An 8th item indicates functional impairment. Scores of 5, 10, and 15 are taken as the cut-off points for mild, moderate, and severe anxiety, respectively.

Disordered alcohol use will be assessed using the Alcohol Use Disorders Identification (AUDIT) instrument. The AUDIT consists of 10 items. Items 1 to 9 are scored 0, 1, 2, 3, or 4, and item 10 is scored 0, 2, or 4. Higher scores indicate greater alcohol use, with scores ranging from 0 to 40. Total scores of 8 or more are recommended as indicators of hazardous and harmful alcohol use, as well as possible alcohol dependence.

Disordered drug use other than alcohol will be assessed using the Drug Use Disorders Identification (DUDIT) instrument. The DUDIT consists of 11 items. Items 1 to 9 are scored 0, 1, 2, 3, or 4, and items 10 and 11 are scored 0, 2, or 4. Higher scores indicate greater drug use, with scores ranging from 0 to 44. A score of 25 points or more is recommended as an indicator of drug dependence.

Suicidal ideation will be measured using the Suicidal Ideation Attributes Scale (SIDAS). Total SIDAS scores are calculated as the sum of the five items, with controllability (item 2) reverse scored (10=0, 9=1, …, 0=10). Higher scores indicate greater suicidality, with total scores ranging from 0 to 50.

Motivation to conceal sexual minority identity will be assessed using the Concealment Motivation subscale of the Lesbian, Gay, and Bisexual Identity Scale (LGBIS). The three subscale items, rated on a 6-point scale, will be averaged for a total score, ranging from 1 to 6. Higher scores indicate higher concealment motivation.

Acceptance concerns of sexual minority identity will be assessed using the Acceptance Concerns subscale of the Lesbian, Gay, and Bisexual Identity Scale (LGBIS). The three subscale items, rated on a 6-point scale, will be averaged for a total scores ranging from 1 to 6. Higher scores indicate higher acceptance concerns.

Internalized homonegativity will be assessed using the Internalized Homophobia subscale of the Lesbian, Gay, and Bisexual Identity Scale (LGBIS). The three subscale items, rated on a 6-point scale, will be averaged for a total scores, ranging from 1 to 6. Higher scores indicate higher internalized homonegativity.

Emotion dysregulation will be assessed using the 18-item Difficulties in Emotion Regulation Scale-Short Form (DERS-SF). Items are rated on a 5-point scale from 1-5; items 1, 4, and 6 are reverse coded. Items are summed for a total score, ranging from 18 to 90, where higher scores indicate higher emotion dysregulation.

Perceived social support will be measured using the 12-item Multidimensional Scale of Perceived Social Support (MPSS). Items are rated on a 7-point scale from 1-7 and averaged for a total score, ranging from 1 to 7, with higher scores indicating higher perceived social support.

Rumination will be measured using the 5-item Brooding Subscale of the Ruminative Responses Scale (RRS). Items are rated on a 4-point scale from 1-4 and summed for a total scores, ranging from 5 to 20, with higher scores indicating higher rumination.

The Past 4-month HIV/STI Testing Questionnaire consists of 7 multiple choice questions previously developed by the study PI for another study asking participants about their HIV/STI testing history. The questionnaire consists of questions, such as, "Have you provided a urine sample as part of any STI test in the last 4 months" with response options of "yes," "no," or "I don't remember." Scores were coded with "yes" being 1 and "no" being 0, and and a total score was assessed as the average of all scores. Thus, total scores ranged from 0 to 1, with higher scores indicating greater HIV/STI testing in the past 4 months.

The Decisional Balance for Condom Use Scale is an 18-item psychometrically validated scale measuring one's motivation to increase condom use (e.g., "I would feel bad if my friends found out I had sex without a condom"), with response options ranging between 1 = not at all to 5 = extremely. Scores are summed for a total scores, ranging from 18 to 90, with lower scores are indicative of greater likelihood to use a condom.

The Safer Sex Questionnaire is a psychometrically validated measure and consists of 13-items based on a 5-point Likert scale assessing one's confidence in avoiding having anal sex without a condom in various contexts. Scores are summed for a total score, ranging from 13 to 65, with higher scores are indicative of greater safer sex self-efficacy.

Participants will be provided with self-administered rapid HIV testing kits at baseline and 8-months post-baseline to assess for incidence of HIV.

Participants will be provided with self-administered rapid syphilis testing kits at baseline and 8-months post-baseline to assess for incidence of syphilis.

As an exploratory outcome, anxiety severity will be measured by the Overall Anxiety Severity & Impairment Scale (OASIS). This 5 item measure uses a 0-4 rating scale and sums across the items for a total score ranging from 0 to 20. Higher scores indicate greater severity of anxiety.

As an exploratory outcome, self-esteem will be measured using the 10-item Rosenberg Self-Esteem Scale. Items are rated on a 4 point scale from 0-3; items 4, 6, 9, 10, and 11 are reverse scored. Items are summed for a total score ranging from 0 to 30, where a higher score indicates greater self-esteem.

Total of all reporting groups

The Timeline Follow-Back (TLFB) assesses retrospective estimates of HIV-related sexual behavior in the past 30 days. The TLFB was originally developed in interview format, but has been adapted as online self-report questionnaire. Participants report on daily partner type (e.g. main, casual), type of sexual behavior (e.g. insertive anal sex, receptive anal sex, oral sex), and condom use. The TLFB has good test-retest reliability, convergent validity, and agreement with collateral reports for HIV-related sexual behavior. Administration time ranges from 10-30 minutes.

For this secondary outcome measure, condomless anal sex (CAS) with casual partners only will be determined.

Intent to Treat Population (participants analyzed according to their original treatment assignment regardless of adherence to protocol) for all participants who completed 4/8-month follow-up assessments.

Depression will be measured using the Patient Health Questionnaire-9 (PHQ-9). A sum score of 9 items indicates depression severity, with higher scores indicating higher severity and a scores ranging from 0-27. A 10th item indicates functional impairment. A cutoff score of 7 or more indicates high likelihood of a depressive episode.

Intent to Treat Population (participants analyzed according to their original treatment assignment regardless of adherence to protocol) for all participants who completed 4/8-month follow-up assessments.

Anxiety will be measured using the Generalized Anxiety Disorder-7 scale (GAD-7). A sum score of 7 items indicates anxiety severity, with higher scores indicating higher severity and scores ranging from 0 to 21. An 8th item indicates functional impairment. Scores of 5, 10, and 15 are taken as the cut-off points for mild, moderate, and severe anxiety, respectively.

Intent to Treat Population (participants analyzed according to their original treatment assignment regardless of adherence to protocol) for all participants who completed 4/8-month follow-up assessments.

Disordered alcohol use will be assessed using the Alcohol Use Disorders Identification (AUDIT) instrument. The AUDIT consists of 10 items. Items 1 to 9 are scored 0, 1, 2, 3, or 4, and item 10 is scored 0, 2, or 4. Higher scores indicate greater alcohol use, with scores ranging from 0 to 40. Total scores of 8 or more are recommended as indicators of hazardous and harmful alcohol use, as well as possible alcohol dependence.

Intent to Treat Population (participants analyzed according to their original treatment assignment regardless of adherence to protocol) for all participants who completed 4/8-month follow-up assessments.

Disordered drug use other than alcohol will be assessed using the Drug Use Disorders Identification (DUDIT) instrument. The DUDIT consists of 11 items. Items 1 to 9 are scored 0, 1, 2, 3, or 4, and items 10 and 11 are scored 0, 2, or 4. Higher scores indicate greater drug use, with scores ranging from 0 to 44. A score of 25 points or more is recommended as an indicator of drug dependence.

Intent to Treat Population (participants analyzed according to their original treatment assignment regardless of adherence to protocol) for all participants who completed 4/8-month follow-up assessments.

Suicidal ideation will be measured using the Suicidal Ideation Attributes Scale (SIDAS). Total SIDAS scores are calculated as the sum of the five items, with controllability (item 2) reverse scored (10=0, 9=1, …, 0=10). Higher scores indicate greater suicidality, with total scores ranging from 0 to 50.

Intent to Treat Population (participants analyzed according to their original treatment assignment regardless of adherence to protocol) for all participants who completed 4/8-month follow-up assessments.

Motivation to conceal sexual minority identity will be assessed using the Concealment Motivation subscale of the Lesbian, Gay, and Bisexual Identity Scale (LGBIS). The three subscale items, rated on a 6-point scale, will be averaged for a total score, ranging from 1 to 6. Higher scores indicate higher concealment motivation.

Intent to Treat Population (participants analyzed according to their original treatment assignment regardless of adherence to protocol) for all participants who completed 4/8-month follow-up assessments.

Acceptance concerns of sexual minority identity will be assessed using the Acceptance Concerns subscale of the Lesbian, Gay, and Bisexual Identity Scale (LGBIS). The three subscale items, rated on a 6-point scale, will be averaged for a total scores ranging from 1 to 6. Higher scores indicate higher acceptance concerns.

Intent to Treat Population (participants analyzed according to their original treatment assignment regardless of adherence to protocol) for all participants who completed 4/8-month follow-up assessments.

Internalized homonegativity will be assessed using the Internalized Homophobia subscale of the Lesbian, Gay, and Bisexual Identity Scale (LGBIS). The three subscale items, rated on a 6-point scale, will be averaged for a total scores, ranging from 1 to 6. Higher scores indicate higher internalized homonegativity.

Intent to Treat Population (participants analyzed according to their original treatment assignment regardless of adherence to protocol) for all participants who completed 4/8-month follow-up assessments.

Emotion dysregulation will be assessed using the 18-item Difficulties in Emotion Regulation Scale-Short Form (DERS-SF). Items are rated on a 5-point scale from 1-5; items 1, 4, and 6 are reverse coded. Items are summed for a total score, ranging from 18 to 90, where higher scores indicate higher emotion dysregulation.

Intent to Treat Population (participants analyzed according to their original treatment assignment regardless of adherence to protocol) for all participants who completed 4/8-month follow-up assessments.

Perceived social support will be measured using the 12-item Multidimensional Scale of Perceived Social Support (MPSS). Items are rated on a 7-point scale from 1-7 and averaged for a total score, ranging from 1 to 7, with higher scores indicating higher perceived social support.

Intent to Treat Population (participants analyzed according to their original treatment assignment regardless of adherence to protocol) for all participants who completed 4/8-month follow-up assessments.

Rumination will be measured using the 5-item Brooding Subscale of the Ruminative Responses Scale (RRS). Items are rated on a 4-point scale from 1-4 and summed for a total scores, ranging from 5 to 20, with higher scores indicating higher rumination.

Intent to Treat Population (participants analyzed according to their original treatment assignment regardless of adherence to protocol) for all participants who completed 4/8-month follow-up assessments.

The Past 4-month HIV/STI Testing Questionnaire consists of 7 multiple choice questions previously developed by the study PI for another study asking participants about their HIV/STI testing history. The questionnaire consists of questions, such as, "Have you provided a urine sample as part of any STI test in the last 4 months" with response options of "yes," "no," or "I don't remember." Scores were coded with "yes" being 1 and "no" being 0, and and a total score was assessed as the average of all scores. Thus, total scores ranged from 0 to 1, with higher scores indicating greater HIV/STI testing in the past 4 months.

Intent to Treat Population (participants analyzed according to their original treatment assignment regardless of adherence to protocol) for all participants who completed 4/8-month follow-up assessments.

The Decisional Balance for Condom Use Scale is an 18-item psychometrically validated scale measuring one's motivation to increase condom use (e.g., "I would feel bad if my friends found out I had sex without a condom"), with response options ranging between 1 = not at all to 5 = extremely. Scores are summed for a total scores, ranging from 18 to 90, with lower scores are indicative of greater likelihood to use a condom.

Intent to Treat Population (participants analyzed according to their original treatment assignment regardless of adherence to protocol) for all participants who completed 4/8-month follow-up assessments.

The Safer Sex Questionnaire is a psychometrically validated measure and consists of 13-items based on a 5-point Likert scale assessing one's confidence in avoiding having anal sex without a condom in various contexts. Scores are summed for a total score, ranging from 13 to 65, with higher scores are indicative of greater safer sex self-efficacy.

Intent to Treat Population (participants analyzed according to their original treatment assignment regardless of adherence to protocol) for all participants who completed 4/8-month follow-up assessments.

Participants will be provided with self-administered rapid HIV testing kits at baseline and 8-months post-baseline to assess for incidence of HIV.

Intent to Treat Population (participants analyzed according to their original treatment assignment regardless of adherence to protocol) for all participants who completed 4/8-month follow-up assessments.

Participants will be provided with self-administered rapid syphilis testing kits at baseline and 8-months post-baseline to assess for incidence of syphilis.

Intent to Treat Population (participants analyzed according to their original treatment assignment regardless of adherence to protocol) for all participants who completed 4/8-month follow-up assessments.

As an exploratory outcome, depression severity will be measured using the Overall Depression Severity & Impairment Scale (ODSIS). This 5 item measure uses a 0-4 rating scale and sums across the items for a total score ranging from 0 to 20. Higher scores indicate greater severity of depression.

Intent to Treat Population (participants analyzed according to their original treatment assignment regardless of adherence to protocol) for all participants who completed 4/8-month follow-up assessments.

As an exploratory outcome, anxiety severity will be measured by the Overall Anxiety Severity & Impairment Scale (OASIS). This 5 item measure uses a 0-4 rating scale and sums across the items for a total score ranging from 0 to 20. Higher scores indicate greater severity of anxiety.

Intent to Treat Population (participants analyzed according to their original treatment assignment regardless of adherence to protocol) for all participants who completed 4/8-month follow-up assessments.

As an exploratory outcome, self-esteem will be measured using the 10-item Rosenberg Self-Esteem Scale. Items are rated on a 4 point scale from 0-3; items 4, 6, 9, 10, and 11 are reverse scored. Items are summed for a total score ranging from 0 to 30, where a higher score indicates greater self-esteem.

Intent to Treat Population (participants analyzed according to their original treatment assignment regardless of adherence to protocol) for all participants who completed 4/8-month follow-up assessments.

Self-monitoring control: Participants will be asked to indicate their past 7-day mood; stress experiences; and mental and behavioral health on an online survey experience once per week for 10 weeks