“IF YOU’RE concerned about embryonic death, you’ve got to be consistent here and give up the rhythm method,” says Luc Bovens of the London School of Economics.
People who practise this form of birth control, the only form condoned by the Catholic church, try to avoid pregnancy by abstaining from sex during a woman’s fertile period. But Bovens says it leads to more embryo deaths than other contraceptive methods.
Bovens estimates that if the rhythm method is 90 per cent effective, and if conceptions outside the fertile period are about twice as likely to fail as to survive, then “millions…
