It’s 6 o’clock on a recent Tuesday night, and Steven Evans, 38, a dapper British investment banker clad in an open robe, gray Tommy Hilfiger briefs, midcalf tube socks and wooden-soled clogs, stands in a sterile Midtown waiting room. He fidgets alongside his pal, a nervous-looking Alex Silver, 39, until their names are called and they’re led into a closet-size room.

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