Romance is when you meet someone who makes you want to cross lines you don't usually cross with others. Sex is the really common one, of course, but I'd argue it's all the rest of the emotional and social stuff that makes it *romance*. Sometimes it's exciting, sometimes it's scary, sometimes it's really warm and comforting. But what makes it a romantic relationship rather then just a friendship is that feeling of wanting to cross a line that you wouldn't cross with anybody else.