In known sperm donation, the sperm donor’s identity is known to you at the time of the donation. You choose the sperm donor yourself. Before a man can be approved as a known sperm donor, he must be screened and risk assessed by a sperm bank, and his sperm quality must be suitable for fertility treatment. By his signature, the sperm donor can accept the treatment and thus also acknowledge paternity of any child and that the child will become the sperm donor’s legal heir. An exemption from the rules on paternity is the situation in which a known sperm donor donates sperm to a woman who is married or cohabiting with a partner who has consented to the treatment and thus accepted paternity or co-motherhood. If a known sperm donor donates sperm to a single woman, he always becomes the legal father of the child.