Sleekit said:
he was born (or possibly woven although its doubtful that's still canon) a boy.
we've seen evidence of this even since the relaunch.
we've seen his crib. we know he looked into The Untempered Schism as an 8 year old.
we know he wasn't created as some fully formed asexual entity.
he has a pre adulthood sexual identity.
he grew into adulthood and full, as far as we know sexual, maturity as a male.
Okay, I don't really understand this argument. Now feel free to correct me since I actually don't watch Doctor Who(I came here because it sounded like an interesting topic).
Now these Time Lords, as I understand them, are practically(or actually?) immortal beings that can take any form every time they go through what would kill us mere mortals(you can't really call it dying now can you). Now, unless there is some fixed traits about them that have to stay intact that the show has established(and whatever hasn't been established, the writers can just make them up can they?) , there is no reason he can't be a different gender or race, right?
I chose to quote that one part of your post, not just because I don't want to fill up so much space, but because I don't really see what the conflict is. So what if he was born a boy? If he had to keep something of himself simply because he was born with it, he would, well, never change appearance at all. I don't see what having grown up with a specific gender would do to the Doctor when he changes. Aren't there many transsexuals out there that are doing pretty fine right now?(Also if all we have is seen him, how would you know he's not asexual)
Again, I haven't watched Doctor Who, but I've only made 2 assumptions:
1. There is no set of traits a Time Lord has to keep when they regenerate
2. If there is, gender was probably never included
As for your argument about men and women not being interchangeable in media, there is one big flaw in it and that is that in order for your hypothetical situations to work, these middle-age parents would have to be HORRIBLY SEXIST!
As for the Original Topic, I say what I always say in these types of arguments. No, there is no good reason to change someone to a different gender or race. But there's no good reason NOT to.