Step 1: Choose a romantic setting. Somewhere outdoors, perhaps, such as beside the sea on a sunny day.
(Subjects in centre of photograph; click to enlarge.)
Step 2: Flirt a little. If male, circle female, bow, puff feathers, drag tail, chase female, shuffle about, coo romantically (using a pidgin).
If female, continue what you were doing for a while. Then, if you like him, join in the dance. Place bill inside male’s bill, bob heads together.
If all goes well, proceed to step 3.
Step 3: If male, stand on female. If female, grin and bear it for a few seconds.
Step 4: Regain composure and prepare for a lifetime of monogamous dove love.
To find out more, have a look here (scroll down for courtship ritual).