sorry raggy, since posting earlier I have been obligated elsewhere. you are correct that adam and eve had 3 named sons, and elsewhere it reads that they had other sons and daughters. yes the sons must have married their sisters. healthwise, that would have been no problem as genetic entrophy [think that's right] had not developed. there was no restriction on near relatives marrying until the law of moses, so I wonder whether the term " incest" with its moral overtones is applicable in the beginning of humanity. bear in mind also, that adam and eve were told to " be fruitful and multiply " . that is gen 1v 28. as v 27 is more generic , ie male and female, not only the first pair. how was the command to multiply be carried out, if the later prohibition was applicable in the beginning. as keith suggested, some suggest some other human creations, but theologically that runs into problems, since the bible teaches universal descent from, and identification with, adam. I hope that, at least explains my reading of scripture . regards pete.