Harkness in rivet is the replicated man talk to pinkerton...
Rivit City
You can find one at Red's shack in Big Town. Speaking to Moira and the doctor in Megaton will add more clues. You'll be directed to find a Pinkerton in Rivet City.
There are no Mounts in the unmodified version of Fallout 3.
There is no more a master key in Fallout 3.
You can find President Eden in Fallout 3 at Raven Rock, but he is also a computer!
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you can not find any energy cells in Fallout 3 after you find the ones with the alien blaster, you are limited to that number
No, you can only craft, find or buy the dart gun in Fallout 3.
fallout3nexus.com
You would need to have the PC version of Fallout 3 and download a mod.
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Sexual themes in Fallout 3 include when you are being born, which I don't find that sexual at all, and when you are in the simulation machine and you meet a man that is having an affair with a neighbor which you only hear about, neither are graphic at all.