The fact that he's interested in other parts of her anatomy beside the Big Four pleases her, actually; it's endearing and makes the entire encounter about more than whamming and bamming.

"I thought..." she lets out a guttural sound of pleasure when he bites her and instinctively squeezes his upper thigh with one hand and the other slides up to lock onto the back of his head. "...You're wearing too much," she points out, squirming to better facilitate the removal of the dress.