Many of us have small homes anyway. A friend says they opined on putting a sister in the spare basement room next to her husband. Hanky panky would not ensue there; I never saw any man who is as clueless as he: never noticing boobs, legs butts, flirting. But it will happen by chance or design. That is one way to pay "rent".
I have yet to see any monies flow back to the trenches.