A childish “knock knock” joke about sex has gotten the Canadian version of the E! network in hot water.

It all began with an episode of “Keeping Up with the Kardashians” that aired Oct. 23, in the 4 p.m. time slot, in which the inexplicably famous Kourtney Kardashian engaged in an argument with her boyfriend over who would perform anal sex on whom.

E! network will have to broadcast a notice twice, notifying viewers of the Kardashians’ reality show that the network violated broadcast standards by airing the episode in a 4 p.m. time slot without a viewer advisory, the Canadian Broadcast Standards Council (CBSC) ruled this week.

The ruling evidently stemmed from a single viewer complaint.

Warning: Graphic and immature language follows

“Knock, knock. Who’s there? It’s my penis knocking on your back door,” Kourtney Kardashian said at one point in the episode, reading a text message from her boyfriend Scott Disick.

In another segment, Kourtney “used a carrot and chocolate donut to simulate the act, following which Scott used a cucumber and a candy gummy ring,” the CBSC noted.

In another scene, Kourtney chases Scott around with a purple dildo. When asked what she planned to do with it, she replied, “Break you open.”

E! network initially defended itself against the complaint by arguing that “the sexual act itself is not explicitly described ... rather, the subject is addressed through euphemisms.” But the network did say it should have aired a viewer advisory beforehand.

The CBSC ruled that the broadcast didn’t violate the rule requiring sexually explicit material to be aired after 9 p.m., but did violate the rule that requires a warning before “sexually suggestive” content.

The Canadian version of E! network is owned by Bell Media.

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  • Kourtney Kardashian and her son Mason seen leaving their hotel on April 24, 2013 in London, England.

  • Kourtney Kardashian is seen in Soho on April 23, 2013 in New York City.

  • Kourtney Kardashian attends the E! Network 2013 Upfront at the Manhattan Center on Monday April 22, 2013 in New York.

  • Kourtney Kardashian arriving for 2013 Elton John AIDS Foundation Oscar Party held at West Hollywood Park in West Hollywood, Los Angeles.

  • Kourtney Kardashian makes her first solo appearance at "Kardashian Khaos" in support of her Kardazzle Makeup Palettes from Khroma Beauty, at the Mirage Hotel and Casino, Las Vegas.

  • Kourtney Kardashian arriving for the Elton John Aids Foundation Academy Awards Viewing Party at West Hollywood Park in Los Angeles, USA.

  • Kourtney Kardashian and Cynthia Bussey during an appearance at Kardashian Khaos at The Mirage Hotel and Casino on January 19, 2013 in Las Vegas, Nevada.

  • Kourtney Kardashian leaves <em>Late Show with David Letterman</em> at Ed Sullivan Theater on January 16, 2013 in New York City.

  • Kourtney Kardashian and daughter Penelope Disick is sighted on December 14, 2012 in Miami Beach, Florida.

  • From Left to Right Kourtney Kardashian, Kim Kardashian & Khloe Karashion seen at Westfield shopping centre for the launch of the "Kardashion Kollection" at Dorothy Perkins on Saturday, Nov.10 , 2012, in London.

  • Kourtney Kardashian attend the launch party for the Kardashian Kollection for Dorothy Perkins on November 8, 2012 in London, England.

  • Kourtney Kardashian and Kim Kardashian make an appearance at North Miami City Hall to receive keys to the City of North Miami on November 19, 2012 in North Miami, Florida.

  • Scott Disick and Kourtney Kardashian arrive at Kim Kardashian's Halloween party at LIV nightclub at Fontainebleau Miami on October 31, 2012 in Miami Beach, Florida.

  • Kourtney Kardashian is sighted on September 25, 2012 in Miami, Florida.

  • Sisters Kourtney Kardashian, left, and Kim Kardashian from the show "Keeping Up With The Kardashians" attend an E! Network upfront event at Gotham Hall on Monday, April 30, 2012 in New York.

  • Kourtney Kardashian arrives at Fox Studios on April 09, 2012 in New York City.

  • Kourtney Kardashian attends the Kim Kardashian Birthday Celebration held at the TAO Nightclub, Venetian Hotel and Casino, Las Vegas.

  • Kourtney Kardashian performs at Plot Your Escape Los Angeles at Hollywood & Highland Center on March 1, 2012 in Hollywood, California.

  • Left to Right, Kim Kardashian, Kylie Jenner, Kendall Jenner and Kourtney Kardashian arrive at Nickelodeon's 24th Annual Kids' Choice Awards on Saturday, April 2, 2011, in Los Angeles.

  • TV personality Kourtney Kardashian arrives at Nickelodeon's 24th Annual Kids' Choice Awards at Galen Center on April 2, 2011 in Los Angeles, California.

  • Kourtney Kardashian at the grand opening of the Kardashian Khaos store at the Mirage Hotel & Casino in Las Vegas

  • Kourtney Kardashian attending Scott Disick's birthday celebration at Gallery Nightclub at Planet Hollywood Hotel and Casino in Las Vegas, USA.

  • Kourtney Kardashian launches her swimwear range 'Beach Bunny Swimwear' at Rehab Pool at Hard Rock Hotel and Casino in Las Vegas, USA.

  • Kourtney Kardashian arrives to celebrate her birthday at Gallery Nightclub at Planet Hollywood in Las Vegas, Nevada.

  • Kourtney Kardashian during Kim Kardashian's 30th Birthday celebrations with "Fallout:New Vegas" at TAO NightclubVenetian Hotel and Casino in Las Vegas

  • Kourtney Kardashian at the Sapphire Pool grand opening party at the Rio Hotel and Casino in Las Vegas, NV.

  • Kourtney Kardashian attends the book signing for 'Dollhouse' at Barnes & Noble at The Grove on November 18, 2011 in Los Angeles, California.

  • TV personalities Khloe Kardashian and Kourtney Kardashian attend the Launch of Kardashian's 'Dollhouse' at 1212 Fifth Avenue on November 16, 2011 in New York City.

  • TV personalities Khloe Kardashian, Kourtney Kardashian and Kim Kardashian attend an in-store appearance for the Kardashian Kollection at Sears on September 18, 2011 in Cerritos, California.

  • Kourtney Kardashian and Kim Kardashian attend the Evening Sherri Hill Spring 2012 fashion show during Mercedes-Benz Fashion Week at Trump Tower Grand Corridor on September 14, 2011 in New York City.

  • TV personalities Kim Kardashian, La La Anthony and Kourtney Kardashian attend A Night of Style & Glamour to welcome newlyweds Kim Kardashian and Kris Humphries at Capitale on August 31, 2011 in New York City.

  • Kourtney Kardashian attends the Kardashian Kollection Launch Party at The Colony on August 17, 2011 in Hollywood, California.

  • TV personality Kourtney Kardashian arrives at the 2011 Teen Choice Awards held at the Gibson Amphitheatre on August 7, 2011 in Universal City, California.

  • Kourtney Kardashian (pictured), along with sisters Kim Kardashian and Khloe Kardashian meet at Sears Headquarters to discuss their fashion line on July 21, 2011 in San Francisco, California.

  • Kourtney Kardashian arrives for the City of Hope honoring Shelli And Irving Azoff with the 2011 Spirit of Life award at Universal Studios Hollywood on May 7, 2011 in Universal City, California.

  • Kris Jenner (L) and Kourtney Kardashian pose for photographers during the 'Unbreakable' Fragrance Launch at The Redbury, Los Angeles on April 4, 2011 in Los Angeles, California.

  • Kourtney Kardashian arrives at QVC Red Carpet Style Party on February 25, 2011 in Los Angeles, California.

  • Kim Kardashian and Kourtney Kardashian attend the QVC 25 to watch party at 229 West 43rd Street on February 11, 2011 in New York City.

  • Television personality Kourtney Kardashian arrives at the launch of AG Adriano Goldschmied's 'backstAGe presents:' initiative featuring The Black Keys at the Marquee Nightclub at the Cosmopolitan of Las Vegas February 14, 2011 in Las Vegas, Nevada.

  • Kourtney Kardashian, Khloe Kardashian, and Kim Kardashian pose for a photo backstage with the award for favorite TV guilty pleasure for "Keeping Up with the Kardashians" at the People's Choice Awards in Los Angeles. A Central California judge has thrown out a lawsuit filed against the Kardashian sisters after they pulled their endorsement of a prepaid debit card that drew criticism for its high fees.

  • Kourtney Kardashian arrives at the People's Choice Awards in Los Angeles, California on January 5, 2011.

  • Kourtney Kardashian at Kim Kardashian's birthday celebration at LAX Nightclub in the Luxor Hotel and Casino, Las Vegas.

  • Kourtney Kardashian at The Anti-Valentine's Day Party hosted by Khloe Kardashian at the Tao Nightclub in the Ventian Hotel and Casino, Las Vegas.

  • Kourtney Kardashian arrives at Khloe Kardashians birthday party at Pure Nightclub at Caesars Palace Hotel and Casino in Las Vegas, USA

  • Kourtney Kardashian at the 7th Birthday celebration of Vegas Magazine held at Surrender Nightclub in Encore in Las Vegas, USA.

  • Kourtney Kardashian celebrates the launch of her new E! Reality Show <em>Kourtney And Khloe Take Miami</em> at the Wet Republic Pool in the MGM Hotel and Casino in Las Vegas.

  • Kourtney Kardashian and Scott Disick arrive to celebrate her birthday at Gallery Nightclub at Planet Hollywood in Las Vegas, Nevada.

  • Kourtney Kardashian Odom at Rob Kardashian's 24th Birthday celebration, held at the JET Nightclub, Mirage Hotel and Casino, Las Vegas.

  • Kourtney Kardashian at Kourtney Kardashian's birthday celebration hosted by Bombay Sapphire at Wet Republic at MGM Grand in Las Vegas, USA

  • Kourtney Kardashian, Bravada International, The Mirage And TLK Fusion Hold Press Conference To Announce The New 'Kardashian Retail Project' at the Mirage Hotel and Casino, Las Vegas

  • Kim Kardashian, Kourtney Kardashian and Khloe Kardashian arrive at the Teen Choice Awards in Universal City, Calif. The Kardashian sisters are seeking to cut ties with a venture that sold prepaid debit cards under their name after coming under attack for the card's high fees.