the time of treatment. Limited donor information includes height, weight, eye, skin and hair colour. In Sweden, this is the extent of disclosed information. In the US, however, additional information may be given, such as a comprehensive biography and sound/video samples. Several jurisdictions (e.g., Sweden, Norway, the Netherlands, Britain, Switzerland, Australia and New Zealand, and others) only allow non-anonymous sperm donation. This is generally based on the principle that a child has a right to know his or her biological origins. In 2013, a German court precedent was set based on a case brought by a 21-year-old woman. Generally, these jurisdictions require sperm banks to keep up-to-date records and to release identifying information about the donor to his offspring after they reach a certain age (15–18). See Sperm donation laws by country. Attitudes towards anonymity For most sperm recipients, anonymity of the donor is not of major importance at the obtainment or tryer-stage. Anonymous sperm is often less expensive. Another reason that recipients choose anonymous donors is concern about the role that the donor or the child may want the donor to play in the child's life or potential legal claims to parenthood. These fears were especially strong for lesbian couples wishing to conceive using a sperm donor prior to legalization of gay marriage or second parent adoptions in their area, because they worried that the sperm donor would be legally viewed as having greater claim to parenthood than the non-biological "social parent" of the child, particularly in the cases of the death of the legal parent or in a separation. Sperm recipients may prefer a non-anonymous donor if they anticipate disclosing donor conception to their child and anticipate the child's desire to seek more information about their donor in the future. A Dutch study found that lesbian couples are significantly more likely (98%) to choose non-anonymous donors than heterosexual couples (63%). Of the heterosexual couples that opted for anonymous donation, 83% intended never to inform their child of their conception via sperm donation. For children conceived by an anonymous donor, the impossibility of contacting a biological father or the inability to find information about him can potentially be psychologically burdensome. One study estimated that approximately 67% of adolescent donor conceived children with an identity-release donor plan to contact him when they turn 18. Some people point out that parents who opt to use a sperm donor to conceive rather