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@Lynnandhubby said, hotel bars have had the best outcomes, but we do a bit of everything including online.
Our advice to newcomers, who tend to focus on the online services, is to keep focused on real-world settings. Beaches (nude is best), bars, casinos (dress provocatively), definitely swinger clubs that allow single males (some do, some don't), and vacation hotspots have all yielded good results for us. Seek and you shall find!