Vinnie should have taken it as a compliment because if Rocky had been able to read his mind he would have had his manhood stripped from him in two seconds flat.
To Rocky the grinding wasn't meant to be subtle. It was meant to make him hot and bothered but not as hot and bothered as he apparently appeared to be right then. If she felt a stiffy she would hardly throw him out! She'd probably laugh, or joke, or - he was stalling? As Vinnie's eyes went from her chest to her eyes, Rocky's blue peepers stared up at him, transfixed. Where had the line been crossed in this? Hell... she didn't think she knew. "You still haven't got it off me," she said softly, her voice having dropped a few octaves lower. Clearing her throat she couldn't quite shake that sultry tone. "I win..."