Are we supposed to post our reasons here? I will, but I will give
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1. Clark ran his fingers through Lois's hair and whispered sweet nothings in her ear.
If there were more than two things he did, you need a comma.
Clark ran his fingers through Lois's hair, slowly stroked her shoulder and whispered sweet nothings in her ear.2. Lois gasped with surprise and she giggled when his beard stubble scratched her cheek. This is the same as #1.
3. Clark slipped his arm around her waist and she closed her eyes in anticipation. Again, 3 things would need a comma.
4. After he kissed her Lois's eyes popped open in recognition. Superman! If the beginning clause was longer, you could use a comma. I think "both" would be a valid answer too.
5. I'm a bit of a comma freak, but I picked "It kind of annoys me but not enough to stop me from reading."
Artemis
