First of all, sodomy is practiced by a very great number of heterosexual couples too, both married and unmarried. A quick look on Google reveals a survey which demonstrated that 30% of the women surveyed in the States had engaged in it at least once. If you're going to annul their marriages too, you're gonna lose a lot of your audience.
You forgot the part about the physically, sexually and mentally abusive husband ... oh wait,
THAT is biblically sanctioned behavior for a "
good" marriage.