If James Gunn had had things his way, the 2002 live-action Scooby-Doo movie would have been an edgy, rated-R take on the classic mystery series. On Wednesday, the Guardians of the Galaxy director celebrated the 15th anniversary of the modernized Scooby-Doo film, for which he wrote the screenplay, by explaining that his original vision for the film was darker than the PG romp that ended up making it into theaters.

“I had written an edgier film geared toward older kids and adults, and the studio ended pushing it into an clean cut children’s film,” Gunn wrote on Facebook. “And, yes, the rumors are true.” Wait, what rumors? “The first cut was rated R by the MPAA, and the female stars’ cleavage was CGI’d away so as not to offend.”

In another comment, Gunn clarified that the R rating wasn’t due to any surprisingly adult plot lines, but rather “some line of dialogue the MPAA thought referred to oral sex.”

In past interviews, Gunn has shared that he wanted to play up certain aspects of the original story to amuse an older crowd, like teasing Shaggy’s apparent pothead habits. He also wanted to more overtly showcase Velma’s sexuality, because he’s “pretty sure she’s gay,” he told the Seattle Times in 2002. “So we had a couple little nods to that in the movie and in the end, again, they were things that kind of (detracted from) the scenes.” For example, the script originally featured a scene where Velma (Linda Cardellini) blatantly ogles Daphne (Sarah Michelle Gellar), and the pair were later supposed to kiss, per director Raja Gosnell. Both scenes were cut to appease the studio’s PG wishes.

Alas, Gunn’s dream of a more adult Scooby-Doo never came to fruition—but the film did pave the way for the rest of his career, which now includes two blockbuster G_uardians of the Galaxy_ films. “I was offered every movie you can imagine,” he writes. “Like, uh, the Jabberjaw movie, and The Jetsons movie, and the Captain Caveman movie. I was offered tons of money to do all of these things. So, of course, me being me, I chose to write Dawn of the Dead. Go figure out my brain, who knows.”