One of my unusual circumstances is that I have a diastasis which substantially (by several Inches) enlarges my natural waist measurement even though most of my residual abdominal fat is below my natural waist. Even guesstimating an allowance for this, my WH ratio would not be what I'd like. 
Also my testicles are essentially non-functional, which throws some of the other answers.
Also my testicles are essentially non-functional, which throws some of the other answers.