Since the dawn of time, or at least since the invention of video cameras, people have been filming themselves having sex. And celebrities are no exception.
In the first a five-part series, Circa chronicles the most significant celebrity sex tapes dating back to the VHS era.
Two members of the pop group The Go Go's, and actor Rob Lowe, dealt with '80s sex-tape scandals.
Celeb sex tapes weren't really a trend until the '90s.
According to sex-tape pioneer Pamela Anderson, stars whose videos leaked more recently got bigger paydays. "Did you see that Hulk Hogan got $115 million for his sex tape?" she told a stand-up crowd in April 2016. "All I got were some stupid Mötley Crüe tickets."
In 1994, figure skater Tonya Harding and her ex-husband, Jeff Gillooly, appeared in a sex tape released just months after their alleged involvement in an attack on skater Nancy Kerrigan.
A censored cut of Kerrigan and Gillooly's sex tape aired on "A Current Affair," and Penthouse magazine sold the tape to the public.
The most famous '90s sex tapes star Pamela Anderson, who had two videos leak in as many years.
Two years after the "Baywatch" star's 1995 marriage to Mötley Crüe drummer Tommy Lee, someone released a video containing explicit footage from their honeymoon.
In an era when the internet was just starting to gain momentum, the wide-spread circulation of the video on the web was a factor in the story becoming national news.
After a website called Internet Entertainment Group posted the video that Anderson says was stolen from the couple's home, she and Lee sued, and later settled, with IEG.
Anderson claims neither she nor Lee, whom she divorced in 1998, made any money off that tape.
"I've never seen it," she told "Watch What Happens Live" host Andy Cohen in 2015. "I made not one dollar. ... [Penthouse founder] Bob Guccione tried to offer us millions of dollars. We said no."
Four minutes of another Anderson sex tape, one with Poison singer Bret Michaels, leaked in '98.
And Tommy Lee isn't the only Mötley Crüe member with a sex tape.
In 1999, IEG released one of Vince Neil's romp with Janine Lindemulder and Brandy Ledford.
But back to Pamela Anderson for a second: Do you think her sex tapes helped her career, hurt her career or had no affect on it?
Let us know by voting in Circa's poll.