Fertile Advice

To the 10 to 17% of U.S. married couples who are childless but want children, Anatomist Edmond J. Farris, head of Philadelphia's Wistar Institute, last week offered some advice on fertility. He told the American Urological Association's annual meeting in Los Angeles:

P:A man is most likely to cause conception when he has abstained from sexual intercourse for five days. In general, said Dr. Farris, only 40% of U.S. males are highly fertile, 17% are sterile. Said he: "We don't .understand what causes about 20% of sterility in men. Maybe it's a result of our civilization."

P: The average woman, with a menstrual cycle of 28 days, is most fertile on the 11th, 12th and 13th days following the beginning of menstruation. Women with cycles of 24 to 35 days should be most fertile from the 9th to 19th day (60% from the 11th to 13th day).

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