How should a couple approach a single female at a club?
Approach as a couple, with the female partner taking the lead on first contact — most single females in lifestyle settings have been hit on by a hundred husbands and prefer to be greeted by another woman first. Be specific about what you're looking for: a chat, a dance, an open-ended evening, or a shared encounter. Treat her as a complete person with her own preferences, not as a fantasy fulfillment for your couple. Most successful unicorn-meets begin with a no-play meet-and-greet, exactly as couple-with-couple meets do.