Regardless of their own status, men are fundamentally averse to encouraging a relationship between any woman and any other man.
Girl: "I love what you and Jane have together. I want that. I should say yes to Jim."
Guy: "No you shouldn't. He's a jerk. I hear he has done time and is $200k in debt."

Girl walks away dejected

Guy 2: "Why did you do that?"
Guy: "All Availability Rule. Never know when I may need her single"
by bobandbill April 7, 2011
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