Although a co-parenting agreement might be useful if, for instance, a dispute arises, it would't be powerful enough in a court if a problem related to parental responsibility arose. Anyways, the legality of such agreements depends on the individual circumstances of each person and the contents of the agreement. Aspects to consider include: religion, schooling, country of residence, rights to the child, etc.
Read the full article on: Using donated sperm: donor requirements, prices and treatments ( 77).

Rebeca Reus
BSc, MSc
Degree in Human Biology (Biochemistry) from the Pompeu Fabra University (UPF). Official Master's Degree in Clinical Analysis Laboratory from the UPF and Master’s Degree about the Theoretical Basis and Laboratory Procedures in Assisted Reproduction from the University of Valencia (UV).