Mike Tyson relives jail-time (and why he sometimes thinks about killing someone so he can go back for good)

Mike Tyson was having so much sex with female prison visitors and a prison drug counselor during his three year prison stint in the '90s, that he was too tired to even go to the gym and work out, the retired boxer has revealed.

The unfaithful heavyweight champion also recalled the day he told his second wife he had AIDS (which he does not actually have) and relives the journey of his career that gave him more than $300 million, yet left him so broke today that he says he will never be able to pay off his IRS debts

The admissions follow a long list of sensational revelations about his personal life, detailed in his autobiography titled Undisputed Truth.

Mike Tyson is suited, booted and sover at the Nevada Boxing Hall of Fame in Las Vegas in August

Tyson constantly warns that he's not far from slipping off the edge, or slipping back into a strip club to party with drugs and women.

'Sometimes I just fantasize about blowing somebody's brains out so I can go to prison for the rest of my life,' he writes. 'Working on this book makes me think that my whole life has been a joke.'

If so, Tyson has yet to figure out the punch line. Though he has reinvented himself in recent years as a family man and vegan with enough comedic chops to act in movies, he says he lives daily with the dark past of a junkie who loved to snort cocaine and drink and was constantly preoccupied with finding women to bed.

The sex is detailed in almost clinical terms, and the many women in Tyson's life flow in and out of the pages like they did in his life.

One big exception is Desiree Washington, the beauty pageant contestant who Tyson was convicted of raping in Indianapolis - a charge he heatedly denies - and spent three years in prison.

Locked up: Tyson is pictured getting fingerprinted after being sentenced to six years in prison in March 1992 for rape

Mike Tyson seen with his second wife Monica Turner in April 1995 - he told Monica that he had AIDS - which was untrue

Tyson says Evander Holyfield was a serial head butter with ties to steroids (pictured biting Holyfield in the ring in June, 1997)

'How do you rape someone when they come to your hotel room at two in the morning?' he asks.

Even in prison he got his fill, he says, first with visitors and then with a prison drug counselor who suddenly became available after Tyson had $10,000 sent to her home to fix her roof.

''I was having so much sex that I was too tired to even to go the gym and work out,' Tyson wrote. 'I'd just stay in my cell all day.'

The book is in Tyson's voice but written by Larry Sloman offers a fascinating look into a life that up until now had already been well chronicled.

It's raw, and so profane that Tyson needs to explain some of the terms he uses for women and blacks in a separate chapter at the end.

Mike Tyson leaves the court in Indianapolis after being convicted on one count of rape and two counts of criminal deviate conduct on February 11, 1992

Mike Tyson leaving the Marion County Courthouse in Indianapolis, Indiana, in handcuffs in June 1994

But it is also quite funny in parts, like the time Tyson forgot about a suitcase that contained $1 million in cash, only to have one of his gofers find it a week later.

'I had had a rough night in the city and had forgotten where I left it,' Tyson said.

Or when his second wife Monica Turner finally tired of his ways and filed for divorce in 2002.

'I guess she had had enough of my fooling around because I sure did a lot of it,' Tyson said. 'Calling to tell her I had AIDS probably didn't help either.'

His publicist confirmed to Mail Online that Tyson does not and has never had HIV or AIDS.

Tyson is brutal on himself throughout the book, despairing of his lack of self-control and feelings of inadequacy.

But he's equally brutal about the people around him. He calls first wife Robin Givens a manipulative shrew.

Tyson says Givens made him act like a trained puppy, that Evander Holyfield was a serial head butter with ties to steroids, and claims the late referee Mitch Halpern was drunk in the ring during his first fight with Holyfield in 1996.

Mike Tyson pictured with his ex wife Robin Givens in 1988 - he has spoken frankly about their marriage and branded her a manipulative shrew

And while he tells an epic tale of beating up British promoter Frank Warren in a London hotel room in 2000 for not paying his $800,000 jewelry bill, he saves special venom for the havoc Don King wreaked in his life.

Tyson was an equal opportunity fighter when it came to beating up promoters, detailing several times he bloodied King, including once on Miami highway when he tried to strangle him in the car from behind.

''When I think about all the horrific things that Don has done to me over the years I still feel like killing him,' Tyson said.

There's more, much more. Tyson knows how to tell a story, and he tells them about people you don't expect, like the day he found actor Brad Pitt at Givens' house.

When Tyson confronted them, he said Pitt begged, 'Dude, don't strike me. Don't strike me. We were just going over some lines.'

He talks about money as dispassionately as he does about sex, though it was difficult for him to hold on to any of it.

When he fired everyone and got new accountants in 2000 they prepared a statement showing he started the year $3.3 million in the hole but made $65.7 million.

Boxing promoter Don King lifts new the heavyweight champion after Tyson defeated Trevor Berbick in Las Vegas on November 22, 1986 - Tyson says Don King wreaked his life

'The problem was that I spent $62 million that year,' Tyson said, including $2.1 million on cars.

Back behind bars: In 2007, Tyson spent 24 hours in jail after pleading guilty to possession of cocaine and driving under the influence

And the Maori tribal tattoo he got on his face? It was supposed to be some little hearts instead, but the tattoo artist talked him out of it.

By the time his career ended with a loss to journeyman Kevin McBride in 2005, Tyson was fat and more interested in partying than fighting.

He would go on to bloat up to 380 pounds and continue to drink, smoke and snort his way through strip clubs and bars.

'I just said to myself, Wow, this is over. Now I can go out and really have fun.'

The book was supposed to have a happy ending, with Tyson slim and happy in his new life with wife Kiki, who he credits for his attempt at sobriety.

But Tyson had to write a new epilogue after acknowledging in August that he had gone out drinking again.

He's back in AA and he's trying to stay sober, he says. But life for Tyson has always been a constant struggle.

'I desperately want to get well,' he says. 'I have a lot of pain and I just want to heal. And I'm going to do my best to do just that. One day at a time.'

At one time he was the baddest man on the planet, a heavyweight champion who terrorized anyone who got in his way, inside the ring or out.

Now he's unburdened himself as perhaps the most tortured soul on earth, with a one-man show on Broadway that Spike Lee has turned into an HBO special airing Nov. 16.

And he's hoping the Undisputed Truth will help him pay off his IRS debts.