You develop good feelings and want to be with them all the time. You love intimacy with them. You like doing stuff with them and you can put up with all their peculiar little habits. You feel a bond and closeness with the person. That's fairly common.
Many women feel very uncomfortable being nude.
You need to make your partner feel comfortable about their body. Sensual touching is good. Then gradually include more light. Tell your partner that you like looking at their body. Tell them that looking at their body adds to the whole sexual experience.