Reine, I am not rationalising! when I was 22 I did not discuss sexual fantasies of any sort with my wife to be. It was not a case of selectively deciding what to tell or not to tell but we did not have that level of intimacy at that stage of our relationship. Of course others may well discuss it at 15 as Nadine did. I think you have missed the entire point of what I was trying to say, which is that everyone is different and that its never as simple as saying I told at the beginning so everyone should.
Nadine, just because some people regret not telling before doesn't mean that everyone should, I know quite a few people who told their SO's and will tell you it was the biggest mistake of their lives. To reiterate, I am neither advocating telling nor not telling. Merely stressing that there is no one size fits all answer.
