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Increasing numbers of young porn addicts are going to therapists because of problems with their erections, an expert has warned.

Top psychosexual therapist Angela Gregory said more and more men in their late teens and early 20s were now suffering from sexual health problems including erectile dysfunction.

The NHS clinician blamed the health issues on men becoming addicted to watching easy-access online porn - often on their smartphones and laptops.

"What I've seen over the last 16 years, particularly the last five years, is an increase in the amount of younger men being referred," she said.

Traditionally erectile dysfunction occurs in older men and is related to conditions such as diabetes, MS or cardiovascular disease.

She told the BBC: "These younger men do not have organic disease, they've already been tested by their GP and everything is fine.

"So one of the first assessment questions I'd always ask now is about pornography and masturbatory habit because that can be the cause of their issues about maintaining an erection with a partner."

The therapist advised anyone who thinks they might have a problem related to porn to contact their GP.