A man who provided sperm to a lesbian couple in response to an online ad is the father of a child born to the women and must pay child support, a Kansas judge has ruled.

A judge has ruled that a US man who donated sperm to a lesbian couple after responding to their online ad is the father of a child born to the women and must pay child support.

A sperm donor in Kansas is fighting a state effort to force him to pay child support for a child conceived through artificial insemination by a lesbian couple.