It seems simple: an egg + sperm = one embryo. But if your sperm is "few, vague and abnormal" and your woman is premenopausal at age 37, things start to get complicated.
2000
2010
1951
2007
1994
1961
1971
2017
2015
2022
2013
1979
2002
1999
2005
1989
1998
