Concerns arise over sperm donors

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　　According to the New York Times' report, Ryan Kramer, the son of a donor², found that he has more than 150 half-siblings - they are all the children of the same donor.

　　"It's wild when we see them all together - they all look alike," said Cynthia Daily, mother of Kramer.

　　As more women choose to have children on their own, the demand for sperm donors³ has surged.

　　Some sperm banks are earning huge profits by allowing too many mothers to receive sperms⁴ from the same popular donors, according to the report.

　　And this trend will lead to risks: rare genetic⁵ diseases could be spread more widely, and the children of the same donor could meet and, unbeknownst to them, commit incest, medical experts warned.

　　Parents and donors are calling for a tighter regulation so that donor children can know more about their donors, and the number of kids from each donor can be limited.

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