Cast two attractive people to play the main roles in your love scene. Age doesn't matter; this could be a love scene between two nine-year olds, a couple of teenagers or two octogenarians. It probably won't be a scene between two divorcees as they will be carrying too much emotional baggage. Make sure at least one of them is dainty or delicate, and the other is perhaps straining for too much effect.
Decide who is driving the scene and what he wants to achieve by the end of the scene. This will be the character with the most motivation shown through his actions. Decide what's to stop him from getting it and add this character trait to your second character. By the end of the scene, both characters will have changed to fit in with the other person's needs, which is cute. Start from one point of view and arc your scene so it ends with the opposite point of view.
Establish a gift that one character offers to the other. This may be a dozen roses or an admission that, over a previous difference of opinion, the other character was actually right. Now take this gift away. For example, the person being offered the gift might sneeze into the roses or, not wanting to upset the dignity of her partner, refuse to accept that her own opinion was right.
Struggle to keep the gift. Now each lover only wants to please each other. "The roses are really nice, honestly" or " I insist you were right and I was wrong." These two people are trying so hard to please each other and at the same time be noticed for their good-natured gestures that all their expression and need for love begin to fall apart.
Toss this struggle backward and forward until the two characters, who at this point are about to walk away from each other, realize there is something of more value -- the fact they love each other. Whatever your scene is about, a cute love scene will create turmoil in the lovers' hearts before true love prevails.