Make the person you're flirting with laugh I guess. I don't really even try, just go for humor. I once hooked up with a girl I met at a party by saying "I'm not scratching my bum on you, just dancing a bit' which I was and she was sitting very close so I could feel her against my bum. She thought it was hilarious. That led to a conversation and all that happened after.
Best qualities for a partner to have?