Can I have different requirements for married/unmarried couples?

[Joel Griffiths]

I have an unmarried couple wishing to rent a place I have in Missouri. I have asked for 3x income from each of them. With a married couple I would only ask for 3x income in total. Is this a legal request?

BACKGROUND: I just relisted this house after an umarried couple broke up two weeks after they moved in. The remaining party was unable to pay rent and I lost my shirt. Fortunately, I made a deal and was able to get the remaining person out after he failed to pay rent, but I took a beating since I'm already cash flow negative on the property for various reasons.

[Mark Bookhagen]

@Joel Griffiths I definitely wouldn't do that and delete any ad that has that in there (craigslist, etc)., You're asking for trouble. Note: they are both separately and fully responsible for 100% of the rent. The rent is one number, not one number divided into two parts.