Ozzy Osbourne has claimed being unfaithful to his wife Sharon was an "occupational hazard".

Ozzy and Sharon Osbourne

Ozzy and Sharon Osbourne

The Black Sabbath rocker protested that he was "not a big cheater", much to his spouse's outrage, as she declared he had "f*****" all their friends, members of staff and the group's fans behind her back - but the 'Paranoid' singer hit back and insisted he was simply doing his job.

Sharon said: "You were a f****** great cheater. You ****.

"You f***** all our friends, all the f****** staff, then you came to me and f***** every groupie there was in the world."

Ozzy laughed and retorted: "Well that was part of the job. That was an occupational hazard."

Sharon, 67, admitted she never expected more from Ozzy - who she wed 38 years ago - than just a one-night stand when they first hooked up.

Speaking in upcoming documentary 'Biography: The Nine Lives of Ozzy Osbourne', she said: "We were really kind of thrown together but it wasn't until August of 1980 that we actually had a relationship going.

"And I thought it's going to be the usual thing that had happened in my past that you know, you go with a bloke, you f*** him one night and the next day he doesn't know you. Like it was before."

Ozzy replied: "I cannot say that with you."

The 'Talk' star claimed drugs and alcohol sent Ozzy's sex drive wild in the 1970s and 80s.

She laughed: "If he would see a guy in a frock he would have have f***ed it - that is the way he is when he is drunk and loaded."

The 71-year-old rocker admitted he is ashamed of how he treated his first wife Thelma Riley, the mother of his two oldest children.

Ozzy - who also has three kids with Sharon - said: "I was on television, radio, people recognized me and chicks wanted to f*** me. It was wow.

"From being a grubby little s*** from Aston - this is the big time. We lived the life.

"I thought money would buy and fix everything. But money would buy the alcohol and the drugs and I would behave f****** badly.

"But what I did to Thelma was wrong. I treated her really badly and the kids. I was a just a selfish self centred p****.

"I f****d around from day one and that ain't cool. and my wife just had enough. I am no good at handling lots of love."