Maybe the reason she flaunts herself is not because she's confident, but because her hourglass figure fits nicely in his hands.
She feels secure when his fingers move slowly from her ribs to her hips, like the way wine racks keep glass bottles from smashing to the ground.
She's fragile and transparent, but he fills her with feeling, and for that moment, she doesn't feel empty; she's vivd and colourful, supplying liveliness.
Maybe she flaunts herself because eyes turn glassy and watery, and at least she can influence something.
Maybe she just hopes that one day he'll hold her as tightly as he does that glass of wine.