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A 16-year-old girl must use a colostomy bag for the rest of her life after severely injuring her bowel during rough group sex.

The teenager's shocking injury happened after she tried to copy aggressive sex acts from porn she had seen online.

Experts say her horrific case is just one of a string of recent examples, which have caused porn-addicted men and women to suffer life-changing injuries.

It is believed to be particularly prevalent in Australia.

"We have seen anal fissures more and more. I’ve seen that more in women, so that’s caused by men having anal sex with women," Bastian Seidel, a doctor in Tasmania told ABC .

Another Australian woman, "Sarah", claims her former boyfriend forced her into having anal sex.

(Image: iStockphoto)

Sarah, 41, was left with nerve damage to her bowel and can no longer cope with hugging her mum because she was so traumatised by the rape.

Speaking in ABC's harrowing report, she said: "In pornography, it’s not how it is in real life.

"It’s just not how it is. It looks like they enjoy it, but it really hurts."

Worryingly, women and underage teenagers are becoming "very powerless to say 'no'," experts believe.

(Image: Photographer's Choice)

Susan McLean, a cyber safety expert and former police officer, said: "It tends to be using objects. It does tend to be quite violent or being tied up, and the girls often feel very powerless to say no."

Porn education organisation Reality And Risk told ABC its research showed that close to 90% of the most popular porn viewed includes physical aggression.

In Australia, online porn is regulated by the eSafety Commissioner, Julie Inman Grant, who has no power to order foreign websites to take down violent porn.

However, content classified as X18+ (explicit sex) cannot be hosted in the country, explained the broadcaster.