where does the sperm come from that fertilizes the egg of the woman? from fallen angels, or humans? can an egg be fertilized without sperm? and why would the fallen angels think, 'oh look, there is a beautiful woman, so let me get out my chemistry set, and we can have genetically altered children'? the big plan was to contaminate the genes of our race. this could have been accomplished without lust, and possibly without artificial insemination, or with no sperm at all. but believing the bible is accurate, these angels lusted after the women, and mated with them naturally. i assume they fertilized the eggs in the process. if this idea is not correct, then the bible is just giving us an easy way to understand that the women got pregnant.