II Center for American Progress | Reproductive Roulette | Part I: Declining reproductive health More women are experiencing impaired fecundity, defined as. Hybrids could also be designed by sexual reproduction, as between apes and humans. [ ] Contrived Should the biological definition rely on the species definition?26 J. Fletcher, The Ethics of Genetic Control. Ending Reproductive Roulette. Moral philosopher Joseph Fletcher has always been 15 to 20 years ahead of his time in exploring the ethical questions raised by modern.