FIFTEEN Penny escaped to the bar as soon as Mystery Man was done with her. It wasn't that she wanted to get away from him as much as...the mortification of some of the stupid things she'd said. She'd tried to be funny, replying with a Simpsons joke, and while she thought he'd understood the reference at the time, now she worried that it made her look childish for referring to a kids' cartoon. Rock stars didn't watch cartoons. In the Jungle, she could hear loud, female voices bragging about all the celebrities they'd met and shagged. Loudest of all was a girl who claimed that she'd even slept with billionaire Gaia Vasse, and how she'd be willing to do a threesome with Mystery Man and anyone he wanted. Smugly, she added, "I told him so, too. He sounded impressed." "I told him I give the