Ari Nagel

Sperm donation When his first son was a toddler, Nagel made his first sperm donation to a lesbian couple who advertised on Craigslist. Shortly thereafter he donated to a single woman he knew, following which he registered in the Known Donor Registry and donated a couple of times a year. In 2016, the New York Post reported that Nagel had fathered 22 children, nicknaming him the "Sperminator". Shortly after the story was published, the New York State Department of Health sent Nagel a letter informing him that operating an unlicensed sperm bank was illegal, but did not escalate the matter. Nagel often travels to prospective recipients, Nagel originally made many of his donations with natural insemination, but later switched to artificial insemination, delivering his sperm in a "cup" to protect himself, and the mothers to whom he donates sperm, from the risks of frequent unprotected sex. Some of his artificial donations were performed in restrooms of Target department stores,

During the COVID-19 pandemic, the pace of Nagel's donations increased as he was teaching remotely, and had a greater ability to travel. Around sixty of the mothers of Nagel's babies formed a private Facebook group and refer to themselves as "Ari's baby mamas". The Baby Daddy (2022) and Spermworld (2024). He was featured in a 2022 episode of This Is Life with Lisa Ling entitled "Got Sperm?".