Jordan - Genesis 16

Its hard to deal with this story in the present world.  A woman has difficulty bearing children, so she let's her husband conceive a child with her "slave-girl."  There are so many things wrong here that its frustrating to read.  Yes, I am sure everything in here is customary for the time, but it makes me realize that when I sang about "Father Abraham, had many sons..." its because Sarah is really given the short end of the deal (and not to mention all the daughters born).  Sure, I know Isaac is coming and Sarah is given her own name, but still, why must the Bible have so much culture stuck in it!