Offense and Porn

Offense noun - A breaking of a moral or legal code.

Porn and offense are semantically related In some cases you can use "Porn" instead a noun "Offense".

Porn noun - Creative activity (writing or pictures or films etc.) of no literary or artistic value other than to stimulate sexual desire.

Offense and porn are semantically related in obscenity topic. Sometimes you can use "Offense" instead a noun "Porn", if it concerns topics such as indecency.