Charlie Sheen is facing a number of lawsuits and being criticised by former partners after revealing he is HIV-positive.

Just hours after Sheen told Matt Lauer on Today that he has had the virus for "roughly four years" and informed all of his sexual partners since that time, the actor's former girlfriend Bree Olson made an appearance on The Howard Stern Show telling a very different story.

She claimed Sheen never revealed to her that he was HIV-positive, and said later in a separate interview: "He's a monster."

READ MORE: Charlie Sheen admits he is HIV positive

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Shortly after Olson appeared on Stern's show, another of Sheen's sexual partners, Natalie Kenly, came forward to say that the actor had also never told her he was HIV-positive.

Sources close to Sheen say he did not find out he was HIV-positive until May 2011, at which time he was no longer with Olson - though he was still dating Kenly.

"I could be dead right now! I could literally be dead right now because he did not tell me that," said Olson on Inside Edition in a two-part interview that will air in the US this week.

"He says he found out when him and I were together. I was living in his house. We were having sex every single night."

Olson, 29, went on to say that Sheen even went so far as to tell her he was "clean", and used lambskin condoms when they were together, which provide less protection than latex condoms and do not protect against viral sexually transmitted diseases such as HIV.

"He used this word: I'm clean. I'm clean and - I know... but I believed him," said Olson.

Charlie Sheen and his goddesses Bree Olson, left, and Natalie Kenly in 2011. Photo / Getty Images
Charlie Sheen and his goddesses Bree Olson, left, and Natalie Kenly in 2011. Photo / Getty Images

"It was like playing russian roulette. That's the best way to put it. It was like putting a gun to my head and pulling the trigger each time."

Olson later said in the interview: "I would never do to anyone what Charlie did to me. That is giving someone a possible death sentence. I would never do that to someone ever."

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As for her message to Sheen, she said: "Charlie, you're a terrible person. You're a terrible person. I will never forgive you."

She was tested on Monday and is not HIV-positive.

Kenly and Olson were both with Sheen at the same time, and he referred to the women as his "goddesses".

Kenly told TMZ she was not HIV-positive and was not upset with Sheen. She said she did not plan to file a lawsuit against the actor.

In the state of California it is a felony punishable by up to eight years in prison for a person to have unprotected sex with someone with the intent to infect them and not disclose their status. It is also a misdemeanour to willfully expose someone to HIV, though that carries a prison sentence of just a few months.

Charlie Sheen talks to Today show host Matt Lauer about living with HIV. Photo / Getty Images
Charlie Sheen talks to Today show host Matt Lauer about living with HIV. Photo / Getty Images

TMZ is reporting that already six of Sheen's former sexual partners are planning to sue the actor for "intentional infliction of emotional distress, fraud and sexual battery".

Some are alleging they have had both protected and unprotected sex with Sheen as recently as a month ago.

Radar Online meanwhile has spoken to a source close to an attorney who said one individual had had sex just this past week with Sheen, and that he did not reveal his status.

"And a second individual claims they had sex with Charlie three weeks ago," said the source.

"All of these people say they were not notified by Charlie about his HIV status and now they want settlements."

In the US, those who are HIV-positive and fail to disclose their status to a sexual partner or who bite or spit on another can face lengthy jail sentences, be put on the sexual offenders register and even be charged with the possession of a "biological weapon".