Justices Thomas and Alito write the court created "a novel constitutional right."
The British man claimed his"Superman-strength" sperm was only to be used for heterosexual families, and not same-sex families or single women.
Legally, same-sex intercourse is still illegal even if the law is rarely enforced.
A June decision recognized citizenship of Kessem Kiviti.
A marriage equality bill hit a roadblock this week, and activists are frustrated but remain hopeful.
It should be noted that same-sex sexual relations are technically still illegal though the prime minister says all are welcome.
New legislation will ban LGBTQ+ adoptions and close loophole allowing recognition of same-sex unions registered abroad.