There's not much difference between sexual and romantic
  thoughts. Both involve fantasizing. Adolescents fantasize about
  a lot of things as do people of all ages. Is it always about sex
  or romance? No. I wanted to travel in the TARDIS with Doctor
  Who. I also was strongly encouraged to french kiss a girl at 15
  that I met on the CB Radio. Tammy "T-Bo". I went along with it.
  Wasn't my thing. Was I thinking about sex at 15? Likely
  sometimes. All the time? No. But I probably fit the nerd
  category: When I was 13/14, I found the Kinsey books on "Sexual
  Behavior of the Human Male" and "Sexual Behavior of the Human
  Female" in the library and read the statistics on all the
  different normals. Hid each of them as I went to the cubicle to
  read them. And yes, I read them. So, curious? Sure. Fantasizing?
  Yeah. But did I *want it*? Not really. When I *did* have
  traditional sex (rather than 'play') I found the whole
  experience hysterically funny and nothing like either the movies
  that horrified sex or the movies that glorified sex, or the
  movies that glorified romance had me led to believe. Never could
  take the experience seriously at any times I've had it. Spent
  the whole time trying not to laugh.