Purchasing donor egg or sperm is not uncommon for those struggling with infertility. For many reasons, be it a hormonal disorder or a same-sex relationship, donor tissue may be the best or only option.
Egg or sperm donation is also called collaborative reproduction or third-party reproduction, and the donors are usually anonymous or unrelated known individuals. But if the donor is a sibling or cousin, the process is called familial gamete donation. The merits of this approach are often debated.