British jazz singer Danny Polaris has been in hospital for two weeks with a painful and life-threatening erection.

Polaris injected an unknown substance into his penis two weeks ago and has had an erection since then.

The Swansea man, who lives in Berlin, injected the enhancing drug after having already taken Viagra during a late-night hookup with a nurse.

The following day, he went to Berlin Pride and wrapped a wine cooler around his erect penis.

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Doctors have reportedly had to stick a seven-inch nail into his urethra with no anaesthetic and tried to withdraw blood with needles. None of those methods have worked.

They fear his penis might have to be amputated.

Photo / Facebook
Photo / Facebook

Polaris described the pain as a "10 out of 10".

The man, who works as a jazz singer and freelance sex columnist, says this was "one of the worst decisions of [his] life".

"Some days I wake up and I just cry about how stupid I was, about what I've lost, about what's going to happen to me," he said, quoted by the Daily Mail.

"Sex is very important to me. I'm a sex writer, I write erotica and edit erotica. I need all the help I can get."

He has been diagnosed with priapism, an erection that won't go away. It can lead to life-threatening blood cots.

His pain is so severe he has blacked out from it at times.

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The enhancing drug appears to have reacted with Polaris' HIV medication as well as the Viagra he had already taken.

His friends have set up a GoFundMe page to help with his medical expenses.