No, Adamís response does not mean incest was forbidden. It has nothing to do with incest at all. You do realize that in the Biblical sense, there was no concept for mother and father at that point! But this just points out that verse 24 was commentary added later (by who, who knows?) and was not an immediate response. Verse 23 *therefore* 24 refers to a mating pair. Just because incest was not an issue then does not mean that GOD is not the same yesterday, today and forever. A human act cannot define GOD, therefore he is not wishy-washy. When you are trying to be fruitful and multiply beginning with one mating pair, incest is not an issue. GOD rested on the seventh day and there was no further creation. Would GOD have said he was done, and then turn around and say oops, I forgot to create two black couples and two white couples so that they canít commit incest (yet today we still do), so that there would be Gentile and Jew (even though Judah had not been born yet). By the time that the laws of Leviticus were laid down, some estimates put the population of Israel to be about 3 million. At this point there is enough diversity in the gene pool, that incest actually becomes detrimental to it. Sin is the misuse of a natural human act. Itís this display of disrespect that is distasteful to GOD. If GOD wants to change his mind then he doesnít need your approval to do it.
Adam said immediately after seeing Eve and saying she was bone of his bone and flesh of his flesh -- Adam said, Therefore, (when the word "therefore" is used it is a continuation of the statement prior) - therefore concerning the woman being bone of man's bone and flesh of man's flesh --- Adam said man must leave father and mother to get a woman who would be bone of his bone and flesh of his flesh. The most natural thinking would be in order to get bone of his bone and flesh of his flesh man would marry a sister. Based on Adam's immediate respnse, that means incest was forbidden. God can not bless male and female to multiply and then make it impossible to multiply any other way but through sinful incest. If God waited until later to make incest a sin, then God is not the same yesterday, today and forever. Wonder what other thing such a wishy-washy God will change His mind on and make a sin that is alright today???????