My only sexual experience pre-puberty was with another boy.

While I am not 100% indifferent to boys, I am overwhelmingly more attracted to girls.

And in the case in point, I wasn't attracted to the boy in question.

In general, I do think that orientations are not as fixed and inflexible as most adults claim theirs to be (though I *do* believe that they tend to become more fixed and inflexible at some time around puberty or adolescence); and in particular I think children are more capable of and willing to try out, just out of curiosity the first time(s) and just because it's fun later on, extra-orientational sexual activities.

And after the fact, I can say that I did enjoy that experience with someone I was not attracted to and who was outside my main orientation. Something that I cannot say about the times that I, as an adult, tried to hook up with peer aged women.

The original question, however, all I can say is "I don't know". I have no reason to suppose it would've been negative; but neither can I, with the mind and orientational mindset I have today, claim with a straight face that I am sure it would've been positive - however, I could easily extend that, because of the same reason, to adult women, to whom I have never been attracted to either.

Now of course, a girl up to 15, or a cute tween boy, now THAT is another story... :p