Charlie Sheen has insisted that any stories about him infecting previous sexual partners with HIV are "bullshit".
The former Two And A Half Men actor went public with the news of his HIV diagnosis in November, and said he had been diagnosed with the disease four years beforehand.
In an interview with journalist and TV presenter Piers Morgan at a one-off event at the Theatre Royal Drury Lane in London, Charlie, 50, admitted he had not always told his partners about his sexually transmitted disease, but said he had not had sex without protection.
He said: "The only couple of times I didn't tell somebody was because the last 25 times I'd told somebody, they used it against me, and they used my medical condition for their own folly and financial gain.
"And the amount of despicable charlatans that I thought were allies, that then turned against me, they were coming out of the woodwork, it was crazy."
Since going public with his HIV status, Charlie has been hit by allegations from previous partners, including former fiancee Brett Rossi and ex-girlfriend Bree Olson, that he had unprotected sex without telling them he had the STD.
Asked if he had put anyone else at risk by having unprotected sex, Charlie said: "I never did. On all five of my children, and my granddaughter, I never did. Because I wouldn't do that to someone. I would not. How could I explain it later?
"And here's the great news: no one has been infected by me. No one.
"They claim the sorrow and the pity or whatever, but that's on them, and again I know the truth."