Therapy is helpful, but there's a good chance your therapist is bound by law to notify "appropriate" authorities if he/she/it (robot?) feels you might be an actual threat to yourself or to others. It's a fuzzy line. If you confess that you get strangely aroused when you see Freddy Kruger kill a obviously-not-teen girl, you'll probably be ok. If you confess that you hang around the playground imagining the mayor's daughter being kidnapped, raped, and dismembered, you'll probably be... not ok.