Ha, ha. This is why we will never have a tandem. I do not want to be under the control of someone else, even DH.
I once said this to the wife of a colleague of DH's who ride a tandem, when we were at a party... I know they do the tandem because she can't keep up with him (and he won't slow a little). That was a mistake. She made a face at me and turned away, when I said I would never be under anyone's control! A few months later, we saw them riding the tandem when we were out riding with our former exchange student son when he was here visiting us. She wouldn't look or talk to me!