I've never done that. When I was younger (23 - 25ish), this woman was just staring at me. I didn't notice, but one of my friends did. I finally walked over to her, keeping direct eye contact with her the whole time. I got whisper close to her and said "I want to lick every square inch of your body!" Well, that was all the encouragement she needed. She immediately planted one on me and the rest of the weekend went down in history.

We only met a few times after that, but it was some hot meetings...