I think what's being asked here is why the moon, often a scary card about hallucinations, illusions, dangers, etc., would be connected with something so positive as Romance. And I think the answer given by pook and others is right on the money. I remember a friend who'd fallen in love. She talked endlessly about her boyfriend. She *gushed* about him. He was tall, handsome, an
Adonis! Perfect in every way!
Well, finally, we met the guy. He was tall, kinda rolly-polly, glasses. Nice. And we all exchanged glances of disbelief and asked, "This is Adonis?"
When people first fall in love, when they are at their MOST romantic, they act like they're under some sort of spell. Bewitched by the light of the full moon--it's written up by the poets--poets, madmen...and those in love all go together. They're all lunatics. Willing to do crazy things, seeing the world in a totally different way from anyone else.
I mean think about it. Think of Knights on a quest killing dragons for a lady's favor, think of Romeo venturing in to the garden of his most dangerous enemies for just a LOOK at Juliet! That's the Moon in control there. Under an illusion, a magical spell, seeing the world by moonlight, acting like a lunatic. And *yes* they can very much be in danger or in a scary situation. They aren't thinking or seeing things clearly. But in the best of circumstances, they are also feeling a magic that parts veils and gives them a most rare, emotional power. Sooner or later, they'll see their lover as a person, not as an ideal...but if they don't lose the power of romance entirely, the union will be forever enchanted.
And everyone else, there in clear, rational daylight, stares at the Romantic and shakes their heads and wonders..."What does he see in her?" Such is the power of the Moon.