One of the things that always grinded my gears is when the heroine bans porn/masturbation saying that she'll be the MC's exclusive sexual outlet. You won't always be available, unlike my right hand.

Bro, I have a core memory of Touko's route in Sanoba when she kink shames you after finding your eroge.
>wtf you like lolis? Are you a pedo or something? Bad! No more porn! I'm gonna burn it all.
I don't know why this particular scene haunts me.