I own apartment buildings and follow the city codes to a T. The people who live in these buildings lead their lives and pay their rent and are good tenants. My attached apartment needs a married couple or a contintint single because I have a pack of kids as well as my own values to consider.
Some suggested your church. Take it one step further, go to several churches in your area.
Get both names on lease...better then having one skip out....
I have nothing against couples of any sort, or a menage a troi for that matter.
But this is your property. Run it as you see fit.
As a practical matter, I would try advertizing in places that are more likely to get you what you want: churches, for example.