An Australian builder has been bitten by a Redback spider on his penis – for the second time in five months.

The spider bit the 21-year-old while he was using a portable toilet on a Sydney building site.

He said he was bitten in "pretty much the same spot " as before.

Jordan, who didn't want to reveal his surname, told the BBC: "I'm the most unlucky guy in the country at the moment.

"I was sitting on the toilet doing my business and just felt the sting that I felt the first time.

"I was like 'I can't believe it's happened again.' I looked down and I've seen a few little legs come from around the rim."

The twice-bitten tradesman had checked under both the toilet lid and seat before sitting down.

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He added: "After the first time it happened I didn't really want to use one again.

"Toilets got cleaned that day and I thought it was my opportunity to go use one.

"Had a look under both seats and then I sat down did my business. Next thing you know, I'm bent over in pain."

The redback spider can be identified by a red stripe down its abdomen.

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A relation of the Black Widow Spider, its bite causes severe pain, sweating and nausea.

There have been no recorded deaths from Redback bites following the introduction of an anti venom in the 1950s.

Professor Julian White from Adelaide’s Women’s and Children’s Hospital said: "Going back 80 years or so when people were still using outhouse toilets it was extremely common, something like up to 80 per cent of cases of spider bites were bites on the male genitalia.