 While harms caused by both secrecy and accidental disclosure can be mitigated to some extent without making identifiable information available, by simply disclosing to children at a young age that they are donor-conceived for example, some argue that more openness is better for familial unity, and that providing children with an opportunity to find out the identity of their donors (even if that is delayed until they are older) is usually best (Nuffield Council on Bioethics 2009).