I'd settle for all males, from puberty onward, being considered pre-paternal. After all, ANY sexually active male can sire a child (I think that Cary Grant sired one at the age of eighty), so perhaps medicine should pay attention to whether or nor "pre-paternal men" smoke, drink or do drugs. Perhaps we should even get Viagra removed, since in some cases it can cause heart attacks, and a man dying of a heart attack definitely isn't good for his unsired children. [/sarcasm]