I don't want anyone to learn about my foot fetish, which is why I just stare at my phone's home screen or at a nearby window.

I think I'm starting to realize why I don't have a real social life.

Well, it's hard to see their butt from the front...

While I get the point you're trying to make, the only normal place to look at when talking to someone is their face, which is kinda small, and the two parts of the face that convey emotion are the eyes and mouth.