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Campaigner Sarah Green from End Violence Against Women said the comments made by broadcaster Nick Ross in his book are "horrible".
The former Crimewatch presenter, Nick Ross, said it "sickens and appalls" him that people could now assume he blames rape victims or "belittle what they suffer".
He said the Mail on Sunday had chosen to focus on a single chapter in his book which "touches on the highly emotive issue of rape".
In his statement, Mr Ross said: "For the record, lest it needs saying, and, as I make clear in the published extracts, anyone who suffers such a violating crime should be the centre of our concerns.
"As I write in the book, rape is one of the most defiling crimes and there is never excuse or justification for it."
He said the book cited research which found that many victims themselves do not regard what happened to them as rape, "even though in law it plainly was".
He continued: "In other words victims themselves plainly see gradations in rape: It has become sacrilege to suggest that there can be any gradation: rape is rape. The real experts, the victims, know otherwise."
Broadcaster Nick Ross has defended comments in his book in which he claims that "rape is not always rape".
He said: "Far from attacking victims the chapter explores why so few victims report rape, why so few prosecutions take place, and whether criminal courts are the best way of helping to deal with the appalling suffering caused by sex attacks."
In his book, Crime, Mr Ross said it had become "sacrilege to suggest that there can be any gradation: rape is rape".
Former Crimewatch presenter Nick Ross has been forced to defend himself over controversial remarks suggesting that "rape isn't always rape".
The broadcaster made the comments in his new book which have been serialised in the Mail on Sunday.
He claimed half of all women who have had penetrative sex unwillingly do not think they were raped.
In a statement, Mr Ross, 65, insisted the book was "serious, carefully researched and evidence-based" and described rape as "one of the most defiling crimes".