Natalie Portman has made herself a promise never to strip naked onscreen -- because she doesn't want to find herself on a porn site.

The actress partially stripped for a sex scene in 2007 movie "Hotel Chevalier," and that was enough to send lusty Internet peeping Toms into overdrive, posting stills of the saucy scene all over the web.

She told WENN, "It really depressed me that half of every review on the film was about the nudity. It made me think I shouldn't have done it.

"I'm not prudish about nudity. I think it's beautiful in films, and sex is such a big part of life. My issue is that I feel it takes something away from what you're doing when the focus is put on the wrong thing. My picture ended up on porn sites, and that's the dilemma."