OkCupid moderators walk through how they decide to ban bad users.
Computerized deletion of accounts using bad words won't work for an app that has to allow for a measure of risqué communication. Instead, real people make the final call, working through cases to ban fake profiles, abusive users, and even people who purposefully don't show for dates.
As social convention stands, I can’t walk into a bar and coyly ask a cute stranger if he’d enjoy being slapped hard in the face during sex. But on OkCupid, that’s essentially what happens.