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The number of women using donated sperm to get pregnant is rising, but many find the cost of treatment at private clinics prohibitive. This has led some women to use unlicensed donors - but are they putting their health at risk?

Simon Watson, 41, has been an unlicensed sperm donor for 16 years, donating once a week.

"Usually one [baby] a week pops out. I reckon I've got about 800 so far, so within four years I'd like to crack 1,000," he tells the Victoria Derbyshire programme.

"I've got kids all the way from Spain to Taiwan, so many countries. I'd like to get the world record ever, make sure no-one's going to break it, get as many as possible."

Very few women are eligible for artificial insemination on the NHS as the criteria are very strict. Private licensed clinics cost between £500 and £1,000 for each cycle of treatment. Men are allowed to father no more than 10 children.

Mr Watson charges £50 for his services - the "magic potion pot" - and most of his clients find...