Not likely to touch his chest/heart with an open hand.
Like many sexual cues, it is triggered from internal emotional motivators.
Throughout your daily life, you ask yourself “Does she like me? There is a cute cashier ringing you up at the store. ” You are working with a girl that is your type exactly, but you don’t want to risk losing your job.
It doesn’t stop you from wondering “Does she like me?
It also, in turn, has the effect of drawing male attention to her various features.
Also watch for the legs tightly pressed together and bouncing or things rubbed together while uncrossed. Self-touching can be said to be the precursor to the touch of another.