Drawing the Line Between Sperm Donor and Dad?

As more people use alternative methods to create families, issues are bound to arise. For one New Mexico mother and her sperm donor, the debate was whether or not the role of "dad" came with financial responsibility. Janna Mintz conceived a son and later a daughter with her friend Kevin Zoernig's sperm. Though the couple signed a contract that Kevin would not be financially responsible for his biological offspring prior to Janna's artificial insemination, after an eight-year legal battle, he has been ordered to pay child support. Do you think the ruling is fair?