Elisabeth Shue didn't have to rent Wild Things to get a look at

Kevin Bacon's not-so-private parts. As his co-star in the just-released Hollow Man, she caught an in-person glimpse of the actor's bare necessities.

"When Kevin starts to become an invisible man, he has to be naked," she tells TV Guide Online. "Some of the time he wore a little g-string, but in one scene he didn't. [And] all I'll say is we got to check it out during many takes. Finally, we just got hysterical ? but that's no reflection on Kevin. He was so comfortable that it made everyone feel comfortable. He was a gem. That man is an extreme professional."

In Hollow Man, Shue plays a research scientist who watches as Bacon tests a serum on himself that induces invisibility. For her part, the Oscar-nominated actress sees the appeal of living life out of sight. "The one thing I'd love to do... I would really want to watch people interact without them knowing that I was there," she admits. "So I can really, really see how people act. That's hard for me now because everyone recognizes me, but I think it's helpful to any actor to be an observer.

"[And] without getting too dark ? because I wouldn't want to hurt anybody ? the voyeuristic sexual side of being invisible also fascinates me."

While filming Hollow Man, Shue says that there was a scene in which she wished she could have vanished into thin air. "I'm suspended in an elevator shaft and I'm petrified of heights," she recalls. "But I didn't tell anybody until the first day I was up there hanging on a wire. That look on my face isn't acting."