Quite a few sexual references, but nothing too extreme.

A boy is stabbed in the hand with a pen. Only a few drips of (off-colored) blood are seen.

A few instances of profanity here and there, but nothing serious.

Virtually none.

Overall, Owarimonogatari is much, much tamer than other incarnations of the Monogatari series in terms of its violence and sexual scenes, however, its plot is often more disturbing than usual and the color scheme and editing give it a horror/psychological thriller vibe at times.