>>725389825
You've got it backwards.
Alien wife for love and affection and sex for pleasure.
Human concubine for cooking, cleaning and sex for reproduction.
>>725391028
There's a lot of potential for them to be hot as fuck but they really aren't unfortunately. All the fun transhumans died before the Imperium was born.
>>725391316
They're still around in the Mechanicus, Tech Priest that spend a lot time around the Imperials look more "human" than some tech priests that doesn't leave the forge