BROOKLYN, New York — Ari Nagel, the controversial figure known as “The Sperminator,” has officially stepped away from sperm donation at the age of 49, ending a decade-long spree that resulted in 176 children across 20 U.S. states, 10 countries, and five continents.
Nagel, a math professor from Brooklyn, announced his retirement on Father’s Day, citing physical strain, mounting legal challenges, and financial burdens as key reasons for his decision.
His unconventional methods — often involving quick handoffs of sperm-filled menstrual cups in places like restrooms, coffee shops, and public spaces — earned him both notoriety and legal trouble.
According to reports, Nagel conducted his donations outside of medical settings, avoiding sperm banks entirely.
Many women found him through Craigslist and parenting forums, seeking alternatives to expensive fertility clinics.
His recipients included single women, same-sex couples, and partners dealing with infertility. Notably, Nagel never charged for his services.
However, the toll of his free donations has been significant. At least five mothers have filed lawsuits demanding child support, with court rulings taking up to half of Nagel’s $100,000 annual salary. Concerns about the quality of his sperm due to his age, as well as legal liability, appear to have influenced his decision to quit.
“It’s time,” Nagel reportedly said, acknowledging that older paternal age carries increased risks for conditions such as autism and other developmental issues.
He advised would-be parents to consider younger donors moving forward.
Despite his prolific donations, Nagel said he made efforts to be present in the lives of many of his children. “Being a father is about more than DNA,” he said. “Presence matters more than biology.”
Nagel’s complex personal life also drew criticism. He has entered into at least five marriages with foreign women, reportedly to help them meet religious or immigration requirements.
His first child was born in 2008 to a lesbian woman he met online, and he shares three children with an ex-wife.
While Nagel has defended his actions as acts of generosity, critics argue that his unregulated approach blurred ethical boundaries and left potential psychological and legal consequences for the children he fathered.
His current partner, a 22-year-old woman, reportedly does not want children, further solidifying his decision to step away from fatherhood.