My Father in Law told me about when he took a girlfriend on the back of his bike for the first time, this was in the old days well before my time.
He was riding along and he thought something not quite right, bike isn't handling too good at the moment but carried on. Sometime later he was pulled over by the police, apperently quite common for the Father in Law ( bit of a rebel).
Suprisingly the police were smiling for once and asked him, were you having a few handling problems by any chance? the Father in Law replied yeah why and how did you know?
It's because your girl friend is riding side saddle, Father in Law turned to his new girlfriend, WTF are you doing?
She replied used to do it properly until I burnt my leg on the exhaust pipe, been doing side saddle ever since.
Suppose that's why she never lasted long with biker boyfriends.