I never fully understood fanservice until I watched Mysterious Girlfriend X episode nine.
Mysterious Girlfriend X has a persistent theme of fetish. The show starts with a fetish for saliva, as everyone knows by now. It doesn’t stop there, though. The show explores exhibitionism, secret love, clothes fetishes, some light BDSM themes, sweat, and tan lines. Episode 9 is about hair. That’s what finally got me.