I've had sex... lots - in my teens/20s. All sorts of
  experiments. Found the whole thing amusing as hell... like.. I
  couldn't be romantic. Stifling laughter more than anything.
  Tried cybersex a few times too long ago (early 90s, gosh) - I
  was able to come up with the right words for the other person
  but whatever they said to me would just make me laugh
  hysterically. for those who get that magical something out of
  it, I think that's awesome and I respect it. Me? it was a comedy
  routine. Also, I always had a crappy back, which would lead to,
  "oh oh oh my back" or "wait-WAIT-wait-wait-wait... left calf
  spasming... stop wait... " laughing the whole time while pushing
  away. "wait - gotta pee.. hang on - dont' go anywwhere... be
  right bac"... Yeah, I was really unromantic. Not that I wouldn't
  do it again, but I've kept myself relationship-free for a long
  time now Not 'cause of the sex really, but the psycho-drama. I
  could handle it better now 'cause i know the signs but at the
  time, I'd get wrapped up in a whirlwind of "wtf is happening?"
  and I didnt like that.