She raised her face, shining, and found her mirror in <his> eyes. I saw them look at each other, and felt the tears prickle behind my lids.
~Diana Gabaldon from Voyager

I leaned over his shoulder now and deposited a bowl of oatmeal in front of him, a smile hiding in his eyes, caught my hand and kissed it lightly. He let me go, and went back to his parritch. I touched the back of his neck, and saw the smile spread to his mouth. 
     I looked up, smiling myself, and found Brianna watching. One corner of her mouth turned up, and her eyes were warm with understanding. Then I saw her gaze shift to Roger, who was spooning in his parritch in an absentminded sort of way, his gaze intent on her.
~Diana Gabaldon from Drums of Autumn

Occasionally books and movies get it right.  If they really want to show two people in love with each other, it does not require states of undress, or acrobatic clinches, or lots of heavy breathing.

All the movie needs is “that look”.

Some call it “locked eyes” or the “the held intense gaze” or “gazing longingly”.   It’s not ogling or lurid or lusty.  

It is the look that confirms: “I want to look into your eyes forever and stay lost there.”

It works for me every time because I am lucky enough to know what it feels like.  I get that butterfly in the stomach feeling anytime it happens.  My husband held my eyes with his from across a room early in our relationship, and forty years later, he still holds them when he looks at me.  And I look at him just that way as well.  The eyes say what there are no words for.  The eyes don’t lie, being both mirror and reflection, as they are portal to both the mind and heart.  The eyes never change even though the years bring gray hair and crow’s feet.

The “look” says “I want to look at you forever, just like this, just as you are, wherever you are — because of who you are.”