"Why there's friction" he repeats.
"To stop us from actually sliding *off* each other just then?"
He laughs, draws one hand across her stomach, wubbadas a breast. "When two objects touch, they blend. Atomically. The molecules mix, the friction comes in because the molecules don't want to be separated." He lightly catches one of her nipples between two fingers, presses against the areola, "when two lovers touch, hold hands, any skin against skin, they're coming together, becoming a single thing..."
They draw together, kiss, breathing in each other's breath. She pushes his shoulders down, throws a leg across him, sits over him. "It's more than that, sweet darling," she says, swaying slightly-- "Heizenberg and the study of the quantum show us that the observer cannot help but change the observed, if only by a very little bit... when you gaze at me, the very act of gazing at me causes me to be altered--"
She leans over, lets her breasts brush over his chest. She takes his earlobe into her mouth, softly and warmly. "--and I love that" she whispers into his ear, presses his body into hers.