She decided to use a sperm donor to start her family.
sperm donor
idiomA man who is the father of a woman's child or children, but no longer has a relationship, or has a hostile relationship, with the woman, and is typically uninvolved with the children as well.
After years of trying to conceive, the couple chose to find a sperm donor through a medical clinic.
The legal framework surrounding the rights and responsibilities of a sperm donor remains a complex issue in modern family law.