I have heard said that the opposition of the church to any form of contraception - or any attempt to prevent conception (pulling out, oral sex, etc.) while still performing coitus - was originally based in an outdated and wrong scientific view that sperm contained a fully formed human fetus that would mature in the womans uterus. (See: This Wiki Link for an overview).
The theory goes that strong opposition to contraception by church leaders was based on the view that wasting sperm is equivalent to killing a tiny, but fully formed human being - a conclusion reached due to incorrect and outdated scientific theory.
I was wondering if there is any truth to that claim?
note: Obviously, The church no longer advocates this view, I'm interested in the historical aspect behind the policy against contraception.
EDIT: I have heard this theory told to me before, but wrote it off as nonsense/urban legend. What prompted me to ask this question is that it was repeated on the rational wiki page on contraception . While not as big as a wiki as wikipedia, it does have a sizable audience, and for a wiki that purports to be anti-antiscience and anti-pseudoscience, having an unsubstantiated claim goes against its mission - especially since this article was featured on the front page recently.
To clarify - Contraception, means any natural or artificial method to prevent conception except for abstinence.