I can just about fathom how Catholics consider the early 'termination' of an embryo or a foetus murder but the birth control dictate flummoxes me.
They can't seriously be suggesting that every spermatozoa exists for the sole purpose of impregnating a women and that denying them access to the uterus is a sin. This has to be a very bizarre and damaging interpretation of Biblical Scripture and not one shared by other Christian sects.
Orgasms are genetically encoded to further the survival of a species. The fun element is a plus but reproduction is not the be all and end all - monkeys and people would not masturbate otherwise. And wouldn't involuntary nocturnal emissions by male Catholic celibates suggest this is just a natural thing, independent of religious strictures?
Is there any justification for such a belief beyond the Bible and is such a belief at all tenable in philosophical terms?