"Sperm donation" is the act of ordinary men donating sperm to couples struggling to conceive. This time, we feature a couple in their third year of marriage. "I understand that it's a concern, but I've just accepted it as part of trying to conceive," says Mayu, the wife, who wants to use the timing method, which has a higher chance of conception because it requires sexual intercourse with another person. While her husband is a bit apprehensive, he respects his wife's wishes. In the end, they choose the timing method, and shortly thereafter, the donor...