The control group will be provided with an e-pamphlet on sexual wellness catered to GBMSM. This e-pamphlet has been developed by the National Skin Centre and Department of Sexually Transmitted Infections Clinic specifically for information on sexual wellness among GBMSM. It comprises segments on HIV/STI symptoms, etiology, information on how to seek help for HIV/STI, behavioral and biomedical methods of HIV prevention.

Participants are asked: "How likely are you to get tested for Chlamydia and Gonorrhea in the next three months?"; to which they may respond:

1. Extremely unlikely to get tested
2. Very unlikely to get tested
3. Somewhat unlikely to get tested
4. Somewhat likely to get tested
5. Very likely to get tested
6. Extremely likely to get tested

Participants are asked: "When did you go for you last (most recent) voluntary HIV test?"; to which they may respond:

1. Never
2. In the last 3 months
3. In the last 6 months
4. 6 to 12 months ago
5. More than 1 year ago

Participants are asked: "When did you go for you last (most recent) voluntary HIV test?"; to which they may respond:

1. Never
2. In the last 3 months
3. In the last 6 months
4. 6 to 12 months ago
5. More than 1 year ago

Participants are asked: "When did you go for you last (most recent) voluntary Syphilis test?"; to which they may respond:

1. Never
2. In the last 3 months
3. In the last 6 months
4. 6 to 12 months ago
5. More than 1 year ago

Participants are asked: "When did you go for you last (most recent) voluntary Syphilis test?"; to which they may respond:

1. Never
2. In the last 3 months
3. In the last 6 months
4. 6 to 12 months ago
5. More than 1 year ago

Participants are asked: "When did you go for you last (most recent) voluntary Chlamydia or Gonorrhea test?"; to which they may respond:

1. Never
2. In the last 3 months
3. In the last 6 months
4. 6 to 12 months ago
5. More than 1 year ago

Participants are asked: "When did you go for you last (most recent) voluntary Chlamydia or Gonorrhea test?"; to which they may respond:

1. Never
2. In the last 3 months
3. In the last 6 months
4. 6 to 12 months ago
5. More than 1 year ago

Participants are asked: "On average, how regularly do you test for HIV?"; to which they may respond:

1. I do not test regularly
2. Once every few years
3. Once a year
4. Once every 6 months
5. Once every 3 months
6. Once a month

Participants are asked: "On average, how regularly do you test for HIV?"; to which they may respond:

1. I do not test regularly
2. Once every few years
3. Once a year
4. Once every 6 months
5. Once every 3 months
6. Once a month

Participants are asked: "On average, how regularly do you test for Syphilis?"; to which they may respond:

1. I do not test regularly
2. Once every few years
3. Once a year
4. Once every 6 months
5. Once every 3 months
6. Once a month

Participants are asked: "On average, how regularly do you test for Syphilis?"; to which they may respond:

1. I do not test regularly
2. Once every few years
3. Once a year
4. Once every 6 months
5. Once every 3 months
6. Once a month

Participants are asked: "On average, how regularly do you test for Chlamydia and Gonorrhea?"; to which they may respond:

1. I do not test regularly
2. Once every few years
3. Once a year
4. Once every 6 months
5. Once every 3 months
6. Once a month

Participants are asked: "On average, how regularly do you test for Chlamydia and Gonorrhea?"; to which they may respond:

1. I do not test regularly
2. Once every few years
3. Once a year
4. Once every 6 months
5. Once every 3 months
6. Once a month

Participants are tested on their knowledge of HIV Pre-Exposure Prophylaxis by providing a response (1=True; 2=False; 3=I do not know) to two questions:

"HIV Pre-Exposure Prophylaxis is an effective means of preventing HIV infection". The correct answer is "True".

"HIV Pre-Exposure Prophylaxis can also reduce the chances of acquiring other STIs". The correct answer is "False".

Each correct answer provides a score of 1 point.

Participants are tested on their knowledge of other sexually transmitted infections by providing a response (1=True; 2=False; 3=I do not know) to three questions:

"Gonorrhea can be transmitted through oral sex". The correct answer is "True".

"Chemsex, or the use of substances during sex, often increases a person's risk of engaging in risky sexual behavior and acquiring HIV or other STIs" The correct answer is "True".

"There is a/are clinics in Singapore where I can test anonymously for HIV and Syphilis". The correct answer is "True".

Each correct answer provides a score of 1 point.

Participants are tested on their knowledge of HIV by providing a response (1=True; 2=False; 3=I do not know) to two questions:

"An HIV-positive individual who has achieved viral suppression or an 'undetectable' viral load has almost zero chances of transmitting the virus to someone else through sexual intercourse". The correct answer is "True".

"An HIV-positive individual on effective treatment can live a long, healthy, and productive life". The correct answer is "True".

Each correct answer provides a score of 1 point.

This is an 8-item scale adapted from Frost & Meyer (2012) that measures a participant's self-perceived connectedness to the LGBT community on a 4-point Likert Scale. The measure is a sum score of all 8 items.

This is a 7-item scale adapted from Scrimshaw (2013) that measures a participant's self-concealment of their sexual orientation on a 5-point Likert Scale. The measure is a sum score of all 7 items.

This is assessed by the question, "In the last 3 months, how often did you use a condom when having anal sex with a casual partner?" or "In the last 3 months, how often did you use a condom when having anal sex with a sex worker/money boy?" (Options are always, more than half the time, about half the time, less than half the time, never used a condom). Participants who give the answer 'Always' are classified as having consistent condom usage for anal sex with causal partners or sex workers.

This is defined as self-reporting a diagnosis of Syphilis, Chlamydia, Genital Herpes, Genital Warts, Hepatitis C, or Gonorrhea at the 3-month or 6-month follow-up.

This is a 6-item scale adapted from Smolenski, Ross, Risser, and Rosser (2009) that measures a participant's self-concealment of their sexual orientation. The measure is a sum score of all 6 items.

This is a 5-item scale adapted from Frost and Meyer (2013) that measures a participant's internalized homophobia on a 4-point Likert Scale. The measure is a sum score of all 5 items.

This is a 10-item scale adapted from Jamil and colleagues (2015) that measures a participant's self-efficacy in HIV testing on a 5-point Likert Scale. The measure is a sum score of all 10 items.

This is a 9-item scale adapted from Pettifor and colleagues (2010) that measures a participant's perceptions on norms around HIV testing on a 4-point Likert Scale. The measure is a sum score of all 9 items.