Quote:
Originally Posted by Munchkin03
This is what I found on Wikipedia, so YMMV:
"The presence of a device in the uterus prompts the release of leukocytes and prostaglandins by the endometrium. These substances are hostile to both sperm and eggs; the presence of copper increases this spermicidal effect.[40][41] The current medical consensus is that spermicidal and ovicidal mechanisms are the only way in which IUDs work.[35]"
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When I read this on Wikipedia it was followed by a sentence that said "Still, a few physicians have suggested they may have a secondary effect of interfering with the development of pre-implanted embryos;[42]"