these participants will be selected using convenience sampling at tourist site at Silom, particularly silom soi 2. thisplace is selected because it is one of the famous gay tourist attractions in Bangkok that has a number of gay pubs such as DJ station and Expresso (TravelGayAsia, 2014). convenience sampling will be used to ensure enough data points can be collected, and is not expected to suffer any loss in utility given that the characteristics of the population are unknown in any case.