I remember having this dream, I must have been five or six (or maybe 7?), where I found myself on my way to the park dressed as a girl. A couple of boys then appeared, at which point some confused thoughts and feelings ensued just before waking up. It feels like some sort of "what if?" randomly generated by my mind more than anything else.
( I was much more comfortable and spent more time in the company of girls when I was 3-4. I particularly loved to playing animal role games with them, oh my... Although one has to say were sometimes a bit too sleepy for my taste, the reason behind my repeated painful attempts to connect with the aggressive treacherous bastards of my own sex was probably the mere certainty, clear as water, that I was a boy too and wanting to be accepted as such by the other boys. )
It's really hard to see that dream as something other than exploratory. The first real foreshadowing of all the shit to come I can remember now took place when I was 9/10. While watching a Disney movie I found myself somehow wishing to be the princess and rather than her dull prince pretender and his assertive pretending. That was... wrong, so I tried to force myself into the "dude" role, but I kept going back to wishing I was the princess. Should I mention that the princess was a forced shape shifter? I think I should. XD Aha! That's the reason why I wanted to be the princess, I thought, not to mention that the guy is dumb as hell and not the protagonist. Let us forget that this has ever happened and wait for more magical-transformation-gender-equality-aware Disney scriptwriters. And so I did. (I don't remember experiencing sexual arousal until 3-4 years later -I was a bit of a late bloomer-, but there might have been some I was unaware of at the time)
[ my English is far from perfect, sorry ]