Okay, hopefully this is all cleared up. I added an additional sentence to the end of the following. It's in bold...
Lovebirds — Press R (Relationship Panel) at the end of the challenge and then filter your list by Pressing the Romantic tab. Count how many individual Sims are Lovebirds and give yourself 1 point for qualifying Sims. NOTE: Lovers, Sweethearts, and Soulmates also qualify given their relationship strength is higher than simply Lovebirds.