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This, of course, is a huge oversimplification. It is possible to have lots of satisfying sex that doesn’t lead to pregnancy because a penis never goes into a vagina. It is possible to have chemical or mechanical problems of the reproductive system that make it impossible or unlikely for penis-in-vagina sex to produce pregnancy. People can also have penis-in-vagina sex while using any of a number of chemical, mechanical or physiological methods to prevent pregnancy (contraception).
But, penis-in-vagina sex has been until very recently in human history the only way to make more humans, and it is only recently that it has been as simple (and difficult) as taking a medicine to prevent pregnancy.
When pregnancy occurs as a result of sex, it may not necessarily lead to childbirth. Genetically abnormal embryos often spontaneously abort, and one pregnancy out of five will end spontaneously before halfway through the pregnancy (20 weeks). Many womenRead more...