There is a review option at whofic.com (which is the largest site for DW fanfiction, and you can go by categories, i.e. right now search specifically for Nine-era fanfic).
The Doctor had none-human companions in the past, absolutely. Four for example started out with a Three-era human one but afterwards only had aliens, and Five's regular gang were two aliens, one human. Then there are eras, like Three's or Seven's, where all the companions are humans. This being said, yes, Earth is special.
Doylist reason: lack of budget through most of the show, of course. Aliens are more expensive. Also, TPTB figured that with the Doctor as an alien, the audience would need a human identification figure most of the time.
Watsonian reason: he just likes us. :) Also, One was pretty much into travelling for its own sake and not yet a hero at the start; his two first human companions were the ones who dragged him into heroism, you might say. So humans are special.
Torchwood: yes, that's the reason. Mind you, Torchwood operates pretty much on the principle that everyone is bi, though most of the regular relationships are m/f, with one exception. The show had a shaky first season, like B5 very different in quality - bad episodes, mediocre episodes, and some really good ones - but found its feet in the second season, so to speak, and I've grown quite fond of it. The controversial third season was outstanding tv holding its own with the best of any other show, and I was blown away by the awesome, but some earlier fans hated it.
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The Doctor had none-human companions in the past, absolutely. Four for example started out with a Three-era human one but afterwards only had aliens, and Five's regular gang were two aliens, one human. Then there are eras, like Three's or Seven's, where all the companions are humans. This being said, yes, Earth is special.
Doylist reason: lack of budget through most of the show, of course. Aliens are more expensive. Also, TPTB figured that with the Doctor as an alien, the audience would need a human identification figure most of the time.
Watsonian reason: he just likes us. :) Also, One was pretty much into travelling for its own sake and not yet a hero at the start; his two first human companions were the ones who dragged him into heroism, you might say. So humans are special.
Torchwood: yes, that's the reason. Mind you, Torchwood operates pretty much on the principle that everyone is bi, though most of the regular relationships are m/f, with one exception. The show had a shaky first season, like B5 very different in quality - bad episodes, mediocre episodes, and some really good ones - but found its feet in the second season, so to speak, and I've grown quite fond of it. The controversial third season was outstanding tv holding its own with the best of any other show, and I was blown away by the awesome, but some earlier fans hated it.