Honestly I don't think we as humans are even capable of understanding the full extent of how sin has warped(mutated)our hearts and minds to our own detriment. Sin has corrupted our nature in ways we can't fathom. The Bible acctually describes sin like it's an inherited virus that has made us all sick. It's infected our very being with self destructive lusts and passions. The bottom line is that any deviation from our original design leads to some sort of harm one way or another whether we realize it or not. There is quite a bit of study done on the harsh reality of homosexual relationships. I'm not trying to suggest that heterosexual relationships don't have problems either. There are allot of stds among gay community, their relationships often end very abruptly, they also are incapable of being part of a family structure with children involved.