Risk is intolerable both for the partisans of sexual freedom as well as society. That is why, beginning with contraception, the logic behind effectiveness leads through abortion, then eugenics, to end in euthanasia.
A common idea underlies these different practices: When they say that a human life does not fit certain "norms of quality" and that it is not worth living, this life -they conclude- may be suppressed by the most effective means available.