Is cheating like the proverbial tree in the forest -- it doesn't exist if there's no one around to catch you? Carrie officially gets back with Mr. Big; Charlotte is swept away with the "Power Lesbian" elite; Miranda's new boyfriend makes her compete with his porno videos; and Samantha gets a "lightning bolt" from her personal trainer, Thor.

Do modern-day singles need modern-day myths just to date? While Carrie and Mr. Big continue their now-it's-different relationship, Samantha starts hanging out with a 72-year-old millionaire, and Miranda hooks up with a bartender who's actually a nice guy.