[alcover]

No, they would know by the angle of your eyes if you were staring that low.

Looking intensely at someone's lips is at times the prelude to a kiss. I think this ambiguity makes them uncomfortable.

[a1445c8b]

I always thought it depended on how closely seated you are to the other person? The closer we are (e.g. seated next to each other over dinner), the higher the chances of the aforementioned reaction.