Third-party reproduction

Third-party reproduction or donor-assisted reproduction is any human reproduction in which DNA or gestation is provided by a third party or donor other than the two parents who will raise the resulting child. This goes beyond the traditional father–mother model, although the third party's involvement is limited to the reproductive process and does not extend into the raising of the child. Third-party reproduction is used by couples unable to reproduce in the traditional manner, including same-sex couples and those where one or both partners is infertile.

One can distinguish several categories, some of which may be combined:

Pregnancy is typically initiated by artificial insemination in the case of sperm donation and by embryo transfer after in vitro fertilisation (IVF) in the case of egg donation, embryo donation, and surrogacy. Thus a child can have a genetic and social (non-genetic, non-biological) father, and a genetic, gestational, and social (non-biological) mother, and any combinations thereof. Theoretically a child thus could have 5 parents.

Surrogacy includes, in its wider sense, all situations where a surrogate carries a pregnancy for another person. Recently, there has been a tendency to separate the gestational carrier situation from the "true" surrogate restricting the term for a woman who provides a combination of ovum donation and gestational carrier services.

In a 'conventional surrogacy', a surrogate agrees to be inseminated with the sperm of the male partner of the 'commissioning' couple, or with the sperm of one of the male partners in a same-sex relationship, or with sperm provided by a sperm donor. The surrogate is inseminated, conceives, and hands over the baby at the completion of the pregnancy. In conventional surrogacy, the egg which is fertilized is therefore that of the surrogate. A famous case involving paternity rights and surrogacy is the Baby M case.

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