Can a thought that WASN'T intrusive in the past be intrusive in the present?

In the past (and I know I mentioned this already in another thread) I used to be turned on and aroused by my sadistic sexual thoughts. I even masturbated to them. Nowadays, I get the same thoughts, except I'm mortified by them. I don't want to masturbate to them anymore.

Since I wasn't bothered by those thoughts when I was younger, I know they weren't intrusive thoughts back then. Now, however, I AM bothered by them. Are the sadistic sexual thoughts therefore intrusive thoughts? Can they be treated the same way as any intrusive thought?

You should see a licensed professional.