Usually people use the slippery slope to avoid things, not encourage a descent into depravity, but to each their own.

In any case, you shouldn't pretend as if this is morally okay just because you can focus in on each individual step and find a way to justify it. There are a lot of crimes that clearly fall into this bucket: stalking, for example. Any one interaction may be innocent, but it's the sum total of actions that completes the picture of abuse.

If you endorse distributing fake naked pictures of celebrities, you are a bad person, no matter your line of reasoning.