We know they had sex in that episode under the influence of the virus.
But if one considers what happens in the "The Measure of a Man", she might have been the most important person on the ship for him. So important in fact that he kept a hologram of her, after her death.
Could it be that they were in a long term relationship after "The Naked Now" and they kept it secret and/or it was simply never shown?
But if one considers what happens in the "The Measure of a Man", she might have been the most important person on the ship for him. So important in fact that he kept a hologram of her, after her death.
Could it be that they were in a long term relationship after "The Naked Now" and they kept it secret and/or it was simply never shown?