Think of the Bible as a road map.
I can tell you that 85 south is the fastest way to downtown from here. It's the straightest, the widest, the fastest. YOU may want to take a different route eventhough the destination is the same. After you get there once and figure out that going a way which has a million traffic signals, small cramped streets, and a bunch of pot holes is not as good you will then go down 85 south like I suggested the first time.
Bible doesn't tell you every minute detail about a lot of things, otherwise it be a mile thick. It does however tell you that 85 south is the quickest way to get where you wanna go. So the key is to have the "map" and to pay attention. If you do, you will see that the message that God created LIFE in the form of a man and woman is the important part (85 south

) and not that it may assume incest down the road (the long way around).
Know what I mean?
The Bible is filled with everyday drama like lying, cheating, sex, laughter, crying, happy, sad, and it even has some specific instructions on how to behave. It is very confusing to read sometimes, but the overall message is the same......God gave his only son as the ultimate sacrifice to save humanity and if you believe what that means, you will be rewarded. The road map is what you need in order to get somewhere, right? Well the Bible is that road map that will tell you how to get that "reward".