"The ethical issues are complicated, and I have no interest in discussing them here. But if a clump of undifferentiated cells in a glass container in a laboratory is a person, then all such clumps of cells implanted by fertility clinics are persons."
Even above and beyond trying to decide if commonly used methods of birth control are 'murder', see below, we would need to acknowledge that in a court of law one could be held negligent for a homicide if one doesn't try to prevent a death from happening. This happened recently in Oregon when some people resorted to praying for their sick child instead of taking the child to a hospital, and the child died. Applying the same to an egg that has the portential to become a child, if one does not fertilize it then surely one has let the child die.
http://en.wikipedia.org/wiki/Abortifacient
The following birth control methods have been proposed to sometimes prevent implantation of a blastocyst, although (except as noted) they primarily work by preventing fertilization:
Hormonal contraceptives[7]
Some herbal contraceptives may work primarily by preventing implantation.[8]
Intrauterine device (IUD)[9]
Although not substances, and therefore not technically abortifacients, the following techniques have also been proposed to sometimes prevent implantation of a blastocyst:
Fertility awareness methods — a philosophy professor has speculated that intercourse during the less-fertile times of the cycle might create embryos incapable of implanting (due to aged gametes at the time of fertilization).[10]
The lactational amenorrhea method may cause a luteal phase defect (LPD). LPD may interfere with the implantation of embryos.[11]
In vitro fertilisation[citation needed]
