I am 43 and have over 1000 children and I am being trolled and told they will have birth defects.

A retired sperm donor has responded after being the subject of a Netflix documentary about how he may have fathered thousands of children around the world.

Jonathan Meijer says he became a donor to help others and give himself a purpose on his YouTube channel, but not everyone is happy about it.

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Now the 43-year-old is the subject of the Netflix series The Man with 1000 Kids, which focuses on the women who used his services to have children and the impact it had on them.

More women in the new series have accused the donor of being a narcissist with a “God-like complex,” claiming he deliberately downplayed the number of children he fathered and reveled in the control he had.

But the Dutch, who has hundreds of children worldwide between the ages of five and sixteen, told the Daily Mail His only goal was to do something meaningful with his life.

“I don’t like to use the word ‘addiction’ but you feel so rewarded, it’s really amazing,” he said.

“It’s a blessing if you only experience it once in your life, but I’ve experienced it many days, and I still experience it many times, because people keep me informed about what’s happening with their children.”

The part-time musician and YouTuber says he has met a number of children and they all seem happy, despite criticism that he has created a high risk of incest.

Jonathan added: “From what I’ve seen, the children are happy. Some have met half-siblings. They go on holiday, they meet each other.”

But in a recent video, Jonathan responded to claims on the show that he had not taken steps to reduce the risk of inbreeding among his children.

As he walked through Hollywood, he said, “My donor children all know they come from a donor, they know my name, I chose the parents I would help with great care and diligence, which means I wanted them.

“One of my demands was that they tell the children that first of all they come from a donor and secondly that I am their donor. That means that at a certain age, very young, they will always know my identity.

“I am an open identity donor. I did this consciously to prevent the effect of inbreeding, so that this would not happen to them.”

In the documentary, a woman is accused of having a donor secretly mix his own amniotic fluid with that of another donor to play “sperm roulette.”

Jonathan, who used to teach social studies, called the claim “nonsense” and said he was considering suing Netflix.

But the biggest criticism of Jonathan is that several people now share the same genes without knowing it.

The risk of consanguinity – when a couple are blood related – is increased. This can cause potential birth defects.

He insists he keeps track of how many children he fathers, estimating the number at around 550, but critics say his estimate is too conservative.

Jonathan started donating at age 26, but he switched to private donations so people wouldn’t have to pay the exorbitant fees of institutions.

In the series, some claim that he came to their home to donate sperm in a cup, which the women then used with a syringe to become pregnant.

One woman he contacted, Vanessa, says he “offered to donate in the traditional way,” which he does not deny in the Netflix documentary.

Jonathan is now banned from donating sperm and faces a fine of £85,000 if he does so.