As a person who was had the pleasure of being involved with two separate productions of Guys and Dolls, I find myself really, ridiculously irritated when people misuse the phrase, "luck be a lady tonight." No, seriously. And it happens more often than you'd think, too!
Over the years, on numerous occasions I've heard men use that phrase in a context that implies they hope to meet a woman and hook up. But really, if people would just listen to the damn song lyrics they would understand that it has nothing to do with taking some chick home at the end of the night. What "luck be a lady" really means is that luck has been on your side lately and you want it to be ladylike and stick with you, loyally and faithfully. Maybe the song should have been called, "luck be a golden retriever" or, "luck don't run out on me now," except those phrases don't have quite the same ring to them.
In conclusion, based on what I know about the meaning of the phrase, I can only assume these people prefer their luck cold, creamy and delicious: