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.