Yes, that's exactly it! When the fandom is fresh and new, then it's like being passionately in love for the first time. Lustfully in love! And in the stories there's dicks and bums and legs in the air and joyful abandon!

But after a while, the lust cools, and maybe you just want to be friends, maybe by then you just love them for their minds. They're cool, fun, great to be with, but keep the pants on, okay? That's when a plot and story and humour become de riguer.