Saphan Kwai is the birthplace of gay culture in Bangkok. This is the oldest gay area in the great city of (male) Angels. Plenty of different types of gay and lgbt-friendly venues are spread out over the area. Whatever you're looking for: it's there. Finding it can be difficult because you'll have to navigate small soi's and the area is quite big. But that's where Pinktrails comes in to help. Explore the richly diverse gay scene of Saphan Kwai, which is conveniently accessible by BTS.
Most of the venues are popular with the local Thai gay crowd. Other Asian ethnicities are common however too. Thais are very welcoming and always happy to see a foreigner visiting their neighborhood. If you're into Thai guys, don't hesitate to check out the extensive nightlife and rich LGBT history this area represents.