How do you approach a couple at a swingers club?
Approach both halves of the couple at once — talking only to the woman and ignoring the man is a classic newcomer error and an immediate filter. Open with something low-stakes: "Have you been here before?" or "How's your night going?" — the lifestyle equivalent of normal small talk. Talk about anything: their work, where they're from, the music. If chemistry develops, it is mutual and obvious; if not, smile, say it was nice meeting them, and circulate. The pace of the entire evening is "talk first, anything else second."