But""Was the second letter of your first girlfriend's middle name between A and M?" is a bad question on many levels -- people who aren't attracted to females,

But""Was the second letter of your first girlfriend's middle name between A and M?" is a bad question on many levels -- people who aren't attracted to females, people who are but have never had a girlfriend (including children), people who got married to their wife as the start of the relationship, and cultures where "girlfriend" would be hard to define because of that sort of thing. I can think of almost perfectly 50/50 questions based on odd/evenness of numbers (is your current weight in grams/age in hours/number of hairs odd or even) but those are completely time dependent.