Sperm donor to become a dad for the 50th time after shocking move

An American man who donates his sperm for free is about to become a father, for the 50th time.

Known as 'The Sperminator', Ari Nagel has most recently provided his services to an 18-year-old woman living in a homeless shelter, in New York City.

Nagel, 43, told The New York Post he didn't know how old Kaienja Garrick was when she approached him for help, last year.

"I never asked her age — I try to help whoever asks," Nagel told the publication. "I think Kai is more mature than I was at her age after everything she has been through."

Garrick has been living in the shelter system since leaving her family home in Queens. She and girlfriend, Dee Slobert, 21, decided they wanted to become parents.

"I knew if I could raise my little sister, I can raise my own baby," Garrick said of her seven-year-old sibling. "I’ve been taking care of her since she was born."

The couple decided against going to a clinic due to the expense and found Nagel through searching the internet.

He's become known for donating his sperm, for free, to women in need around the world.

Two weeks after Nagel and Garrick met, the 18-year-old found out she was pregnant with a little girl.

She was recently thrown a baby shower by women who've had children thanks to Nagel, who gifted her with nappies, clothes and money.

Garrick, who will receive her high-school diploma later this month, was thankful to Nagel for providing his sperm without asking her any questions.

"It’s good not to ask a lot of questions — it’s a woman’s choice," she said.

But Garrick does have one reservation about Nagel being a father to 50 children – she admits that her daughter will have to enquire about a person's background before they start dating, to ensure they're not related.

"[Nagel] has so many kids, you don’t know who the siblings could be," she said.