TOPEKA, Kan. (AP) — A Kansas man who donated sperm to a lesbian couple after answering an online ad is fighting the state’s efforts to suddenly force him to pay child support for the now 3-year-old girl, arguing that he and the women signed an agreement waiving all of his parental rights.

The case hinges on the fact that no doctors were used for the artificial insemination. The state argues that because William Marotta didn’t work through a clinic or doctor, as required by state law, he can be held responsible for about $6,000 that the child’s biological mother received through public assistance — as well as future child support.