It is a most complex topic.
For starters, there are varying forms of romance.
You have a mindful, business-like, intellectual, poetic wine and dine romance. I can treat you better than this fellow, strategically.
Another form is body romance, which can't be faked or bought, physical in nature, adjacent to passion. Foreplay, intimate signaling, excess stimulation and committing to whatever she or he needs to feel satiated. Then maybe you cuddle by a roaring fireplace. Putting in overtime. That's romance too.
It's the classic divide between the brain and the body. Logic versus intuition.
Regardless, when a man and woman merger together, when their bodies and minds are fully cooperating with each other, that's when the inexplicable cosmic magic happens.