According to Author Stefanie Worth, the best romantic moments are built through years of love and trust: 

Real romance, to me, isn't built around or dependent on an occasion. To me it stems from a sense of security grown through time and trust. That's why – as a writer – one of my favorite romantic moments takes place in my novel Where Souls Collide.

My secondary couple, Vee and her husband Mack, have been married five years. And they adore each other. They believe they're soul mates and that nothing – be it another person, different circumstances, or the distance of parallel realms – can change the love they share.

In a scene early in the story, Vee suffers a nightmare in which Mack is taken from her. When she awakens to find him beside her still, her wedding band where it's always been, and stars shining onto them from the window across the room, she is reassured that they are destined to always be one. Steady faith and certainty rise above the temporary high of any specially designated day, beyond even "till death do us part." 

That's love. That's super sexy.
That's real romance.