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5. Time Lords can change sexes. I'm sure a few people punched the air when we heard that one. I still don't want the Doctor to turn female, though I'll be honest Suranne Jones is now my choice if they ever do. And if he regenerates in the TARDIS again, that's actually feasible....
While that is indeed a possible read of the dialog as stated, I need to point out two alternatives:
5a. Time Lords might change sexes the same way humans do ... through hormonal treatments and sex-change surgery. I'm not suggesting that a regeneration can't change a Time Lord's sex, only that the dialog doesn't nail matters without wiggle room.
5b. "Rule #1, the Doctor lies." And so do other people. And they're just plain mistaken sometimes too. Anything said without being shown could be a lie or an error.
And that's really where this issue will most likely remain until the Doctor or other Time Lord is shown to change sexes immediately after regeneration, or we have a very boring scene involving a panel of experts on Time Lord physiology discussing the possible outcomes of a regeneration.
Now all of you hush up, I want to go back and give Starsuperion's post a very careful read
