A lot of misunderstandings arise when people understand key terms in different ways. "Passion" may invite that problem more than many other words.

The word's core meaning is to be affected, even overwhelmed, as if by something from outside of you. Not a choice, in other words--you can help what you're feeling.

Sexual excitement/desire/pleasure that transports and transforms you till you do things "in the throes of passion" that transcend your normal inhibitions.

Crimes of passion, when violence is triggered by grief or rage.

Passion for a cause, such deep caring that you make heroic efforts and sacrifices for its sake.

Or (most familiar to me in recent years) the kind of fascination that takes hold of me when I discover something of such beauty or depth of meaning that I cannot easily let go of it. That's pure gold for a writer, as you know--you're mining that lode every day.

The best passion in a relationship--aside from the sexual kind--is that last one. When the person in my life, and my relationship with her, inspires me to draw ever closer to her, and makes me want to know her ever better and more deeply. Let me find that kind of passion--and the knowledge that it is returned--and I'll stage whatever cinematic scenes it takes to make my feelings known.