The love scenes that worked, regardless of the director, were the ones where the actors weren't fearful. When somebody was fearful, you could see it right away. It takes you out of the story, and that's to be avoided at all costs.
“I'm an inveterate fox and not a hedgehog, so I always think you should try everything.”
“For each of us who appear to have had a successful experiment there are many to whom their own experiments seem barren and negative.”