Sacha Newley, whose memoir Unaccompanied Minor comes out this week, claimed his father's perversion wrecked his parents' marriage.
But Collins, 84, the former star of TV's Dynasty, says Sacha's allegations aren't true.
Sacha, 52, told The Sunday Times about singer/actor Anthony, "He was a pedophile. My father was drawn to youthfulness.
"He thought innocence was an aphrodisiac. That was his sexual proclivity and it's a very dangerous, destructive thing," he said.
Sacha, an artist, continued that growing up was strange because, "My father put sex front and center. He exposed me to all of that — it was absolutely inappropriate."
Collins' son claimed his dad's 1969 X-rated 1969 film, entitled Can Heironymus Merkin Ever Forget Mercy Humppe and Find True Happiness? is a "confession of pedophilia."
It starred Anthony and his real life wife Collins played his wife in the film, which he also directed. Sacha and his sister Tara portrayed the couple's children.
According to Sacha, the movie depicts the character Mercy Humppe as the "perfect child-lover — an underage girl," he said. "My mother was destroyed by that film."
Sacha has alleged his mother "abandoned" him and his sister Tara as children.
Collins also reportedly feuded with her late famous writer sister, Jackie, as Radar has reported.
Anthony and Collins divorced in 1970 and he died in 1999.
The Dynasty diva has been married five times and is still wed to current husband Percy Gibson, 52.
Collins told the Daily Standard in a statement on Sunday about her son's charges, "As far as I'm concerned this is absolutely untrue. I have nothing further to add."
Her daughter Tara, 54, said she is "deeply upset" by Sacha's claims about their late father.
"From my end, I don't recognize the man he is describing. I had an incredibly close relationship with my father and am deeply upset by these false allegations," Tara said.
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