Action, reaction, motivation, emotion, all have to come from the characters. Writing a love scene requires the same elements from the writer as any other.
Nora RobertsWhat time is it in New York?" He shook his head. "An hour later than it is here. The earth simply has to revolve, Eve, however annoying it is for you." "It can revolve all it wants. I just don't see why people can't settle on the same time.
Nora RobertsHe blinked, then roared with laughter. "Eve Dallas, Vampire Slayer. One for the books." ~Eternity in Death
Nora Roberts