In a champagne flute or piece of cake are the cliched ways men have proposed over the years, but not Bear Grylls.

The resourceful British adventurer rather presented his wife Shara with her engagement ring having kept it secure between his buttocks during a skinny dipping session.

'I pulled out the ring from my butt cheeks,' Bear says in an upcoming episode of Piers Morgan's Life Stories.

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He loves his birthday suit! Bear Grylls recalls his naked proposal to his wife on Piers Morgan's Life Stories

'She was standing there going "what are you doing?" She was in a towel and a massive Atlantic roller came and I went, "will you" – and it went – took me up the beach.

'I had all the seaweed and I was spinning around, so I tried it again and, and in this sort of moment of heavy sedation she said yes.'

It seems Bear is a naturist at heart as he says that he loves going for naked swims. He told Piers: 'If there’s a substantial body of water around and nobody’s looking, I’m often quite tempted to strip off and dive in.

Story telling: The British adventurer showed Piers what happened during the watery proposal

It seems nude piano playing is another of his party tricks, and he also tells Piers about the time he sent Dermot O'Leary a nude photo.

'I think [Dermot], he texted me going where are you at the moment? And I sent him a picture of me doing a sort of ... [Piers interrupted and showed Bear and the audience a picture of Bear diving naked off a rock].'

Bear explained 'We own this little island in north Wales and there’s a great cliff jump into the sea and I do this every morning to be honest when I’m up there and before anyone’s out.'

But it wasn't all jokes during the open interview, as the former SAS soldier spoke about the allegations of him staging parts of his survival shows.

Tough topics: Bear discusses the allegations of him staging parts of his survival shows, as well as his father's death

Loves it: Bear once sent Dermot O'Leary a naked pic of him diving into the sea

'Its a tough thing isn’t it for someone to call you a cheat. When all this blew up, how did you react to that?' Piers asks.

'It was definitely hard,' Bear replies, 'There was substance to that one allegation about a hotel and I had done that for a night.

'The truth was we’d been away filming all over the world in Borneo and Alaska, all these places, and Marmaduke, our middle son had just been born so it was eight years ago now and suddenly we were filming back in Scotland.

'I thought absolutely heaven, brilliant with the family so I said to them come on up. They came up, we spent a night in a B&B together it was brilliant, didn’t think anything more of it and like two years later I woke up one morning and suddenly this had come out.

Bear adds: 'I really regret that but it’s not my first mistake, it’s not my last mistake and I think I had to develop fast, you know broad shoulders for this, but it was a baptism by fire into the negative media side.'

The episode also sees Bear emotionally remember the moment he learned of his father's death, and the bullying he suffered as a child.