Since most people don't use their math skills during sex, I find it highly unlikely that anyone has ever proved they are straight with a linear equation. That leaves room for the scientific method, which for those artsy types, means you propose a theory and then proceed to test whether the theory is true or false through experimentation. Unfortunately, the only way for most people to prove they are not gay is to put your hot dog in a bun or munch on a carpet and then rate your feelings of repulsion on a scale of 1-10. I'm one of those rare few who have actually been able to utilize matrix multiplication to solve for my not-gay gene. But have you ever tested your heterosexuality and how repulsed were you on a scale of 1-10?