Thanks for your input @davedickeyyall! Yes, there was incest. Remember that Adam's wife was formed from one of Adam's ribs. How about that for incest? Remember that Abram married Sarai? That was Abram's half sister. Remember Jacob married Leah and Rachael? Jacob married his cousins. So yes there was incest, it only became illegal to do incest after the law of the LORD according to Moses. Remember in the early 60's you didn't get a ticket for not wearing seatbelts and as of today, at least where I live you can get a ticket for not wearing seatbelts. So before the law given to Moses, incest was OK, as a matter of fact it had to be in the beginning. Cain married his sister and Seth married the other sister. All of them, the children of Adam and Eve. So before the law given to Moses incest was allowed.

One must trust God. Look what is written, Trust in the LORD with all thine heart; and lean not unto thine own understanding. Proverbs 3:5. Remember that the LORD created even evil, for it is written, I form the light, and create darkness: I make peace, and create evil: I the LORD do all these. Isaiah 45:7. So let's even look at Lucifer, as it is written, Thou the anointed cherub that covereth; and I have set thee: thou wast upon the holy mountain of God; thou hast walked up and down in the midst of the stones of fire. Thou perfect in thy ways from the day that thou wast created, till iniquity was found in thee. Ezekiel 28:14-15. So let's end with this scripture, as it is written, For my thoughts not your thoughts, neither your ways my ways, saith the LORD. Isaiah 55:8.