1. A powerful emotion, such as love, joy, hatred, or anger.
a. Ardent love.
b. Strong sexual desire; lust.
c. The object of such love or desire.
a. Boundless enthusiasm: His skills as a player don't quite match his passion for the game.
b. The object of such enthusiasm: Soccer is her passion.
As you see, passion has many forms. So in a relationship, that could mean hugging kissing, cuddling, holding hands, love notes, love letters, special surprises, romantic dinners, a late night swim or hot tub, the list can go on forever.