Abstract: A sperm donor is the biological father but not the social father of a child conceived through donor insemination. What is the significance, if any, of the genetic connection between the donor and donor offspring? How do the various stakeholders perceive the significance and how does the variety of views influence legislation? Initially, donor insemination was an informal arrangement between doctor and patient in which the genetic connection with the donor was downplayed or even concealed. As the practice became formalised through specialist clinics, the anonymity of donors was maintained. As donor-conceived children reached adulthood, however, some of them challenged the policy. The ensuing debate has resulted in significant legislative changes.