A sperm donor has been ordered to pay child support for the biological daughter he fathered to a lesbian couple who found him on Craigslist.

Three years ago, the man answered the couple’s ad that said, “We are foster and adoptive parents and now we desire to share a pregnancy and birth together.”

The donor, William Marotta, is married and fosters children with his wife. He provided the sperm for artificial insemination and signed a legal document where he gave up parental rights and financial responsibilities for the child.

The arrangement changed earlier this year when one of the women, the only parent registered on her daughter's birth certificate, applied for social welfare because of ill health.

The Department of Children and Families decided the man still has a duty to support the child since he is the father, and the original document has been ruled as invalid.