Ever since video cameras became available to the masses in the VHS era, people have been filming themselves having sex. And celebrities are no exception.
Part 4 of Circa's celebrity sex-tape chronology includes socialite Kim Kardashian's video, which arguably launched the Kardashian dynasty as we know it today.
Kim's dad, lawyer Robert Kardashian, had been the most famous member of the family until 2007.
Everything changed with the release of a sex tape starring Kim and her one-time beau, Ray J.
Porn company Vivid Video got a hold of the socialite and hip-hop star's revealing video and distributed under the title "Kim K Superstar."
That's when the third-oldest daughter of the late Robert Kardashian -- who was part of the legal team that defended O.J. Simpson during the football player's 1994 murder trial -- launched a legal battle of her own.
Long before mainstream audiences even knew she had sisters, Kim Kardashian sued Vivid. She reportedly received a settlement of between $3 million and $5 million.
Months later, "Keeping up with the Kardashians" premiered on TV, and, well, you know the rest.
While discussing the tape with Oprah Winfrey in 2012, Kim Kardashian said she felt "humiliated" after its release "introduced [me] to the world."
Kim asserted that she didn't leak the tape herself, adding, "Why would anyone put that humiliation their family? ... I had to explain [the sex tape] to my grandmother."
Kardashian wasn't the only celebrity to have a sex tape leak near the end of the decade.
KISS singer Gene Simmons' lawyers called for a cease-and-desist when his sex tape leaked in '08.
Another 2008 sex-tape leak involved actor Verne Troyer and one-time girlfriend Ranae Shrider.
Claiming the tape had been stolen, Troyer battled in court to limit the extent of its release.
For previous chapters of Circa's history of celebrity sex tapes, check out the attached video and link for Part 1 (1980-2000), and scroll down for more.
Part 2 covers Paris Hilton's sex tape and other videos released soon after the start of the new millennium.
Part 3 chronicles a surge in celebrity sex tapes, including unrelated videos filmed and released by Joanie "Chyna" Laurer and Dustin Diamond.
What's the first thing you think about when you hear Kim Kardashian's name? Vote in Circa's poll, and expound upon your answer in the comments section.
For more news of the day, check out our 60 Second Circa.