I too think Vulcan's have deep, profound emotions and passion but have developed the ability to "control it lest it control them" (Sarek to Spock - Star Trek XI). And Spock must contend with his human side which has less ability to control those emotions. And too, in ST XI he is a young Vulcan not having gone through Kalinar yet so it might have been even more difficult for him.
It does raise a question for me.... how would Spock learn how to please a human woman? How did that relationship begin? Just curious...
Cave Canis