The use of IVF procedures raises a number of ethical questions, starting with those related to the origin of the egg and sperm, to those related to the fate and number of embryos. One of the biggest ethical concerns with this procedure is the origin of the egg. As mentioned earlier, during in vitro fertilization treatment, the retrieved eggs are combined with the sperm for fertilization. The fact that fertilization occurs outside the body, without emotional and physical union between couples, is one of the main arguments. Since only the physical aspect of reproduction is considered, most opponents view this conception process as unnatural and a threat to the family unit. Most religious groups support this view. The Catholic Church, for example, holds that only God is the center of creation; he designed the way children should be designed, and no one should alter his creation. They also refer to sex selection by doctors, which is a special in vitro fertilization procedure, because they are "playing God." Another ethical concern concerns the subsequent treatment of the egg and embryo. The goal of the in vitro fertilization procedure is to retrieve and fertilize enough eggs to establish a successful pregnancy. Most often, not all of these embryos are used during treatment; some are frozen for later use. Other embryos are donated, used for research purposes or discarded and sometimes destroyed by selective pregnancy reduction. Each of these alternatives raises a number of ethical questions. Since 1970, more than 500,000 frozen embryos have been stored, with an additional 20,000 embryos each year and most of these will go unused (Clark, 2009, p. 2). For some people, the destruction of these embryos constitutes an act of murder because... middle of paper ...... spontaneous miscarriages are comparable to 2.5 percent of miscarriages after twin reduction (Mcclimans, 2009, p. 295-303).It is also important to mention that the in vitro fertilization cycle is very expensive and few health insurance companies cover it. Therefore, limiting the number of embryo transfers can be problematic for participants who want to have more than one child but do not have enough money to sponsor each cycle. A study published in the New England Journal of Medicine in 2002 found that the rate of multiple pregnancies with triplets or more increases in states where the in vitro fertilization procedure is not covered (RESOLVE, 2013). David Orentlcher states that “the lack of coverage for in vitro fertilization treatments constitutes unfair discrimination against infertile people.” Therefore, limiting the number of embryos must be combined with insurance coverage.