I make a point of hitting up sets with 1 guy 1 girl regularly. Regardless of how blatantly inappropriate it is. It's how I warm up. You realise after a while that it's all in your head. It's often just some random douche instead of a boyfriend (especially in a club), and even if it is the boyfriend most guys lack the balls to do anything aggressive. Provided you're friendly they're blindsided and can't do shit except be friendly back. I've done it dozens and dozens of times and the worst I've ever had is a couple of fuck offs.