It’s so widespread now,” said a 42-year-old Singaporean company executive who only wanted to be identified as Jack. “There are a lot more people that are open to the idea. With more than 6,000 members, the Web-based United SG Swingers is one of the biggest. There are at least 10 swingers clubs in Singapore, most of them private, some of them online. In Sydney or Seattle nobody would bat an eyelid, but the couples are part of a thriving underground swinging scene that is an anomaly for a country where oral sex is illegal and Playboy magazine is banned. There are more than 10 swingers clubs in Singapore, most of them private, some of them online. A couple looks at the Singapore skyline in a file photo.