Only human companions can be romanced in Fallout 4 so no robot lovin' for you

And no, you can't marry your German Shepherd no matter how much you love him. Yesterday during a Fallout 4 panel hosted by Todd Howard at QuakeCon 2015, the developer announced there would be 12 companions the player could take on their trek across the wasteland. Only one can be used at a time, so they can't be used