Retrogress: (Verb) Go back to an earlier state, typically a worse one.

Since we all knew it was only a matter of time before she would revert back to her whoring ways, Paris Hilton was seen getting comfortable with her ex, Greek shipping heir/man whore to the celebrities, Stavros Niarchos in Miami this weekend.

"Paris and Stavros were all over each other," the witness tells Star. "They were at the same table for about an hour and then they left together. It didn't seem like Benji was on her mind at all!" (Source)

I guess you can't blame Paris Hilton for being a whore any more than you can blame a dog for rooting through the trash or having an accident in the house. Because when it comes down to it, they're just poor, dumb animals that don't know any better. Then again, my dog doesn't really do that kind of stuff, but my dog is also way smarter than Paris Hilton. She can catch a frisbee right in her mouth! You could never train Paris to do that.