See, when I was a kid, I noticed he did a lot with telepathy and mind control, and that there always seemed to be a telepath on the team even if he had to dig one out of the remainder bin (i.e. Betsy). I figured that telepathy was just something he liked playing with the implications of, and that it was why the dude was writing X-Men to begin with.
Now, of course, from an adult perspective, every other issue looks like a letter to Penthouse Forum in its embryonic stage.